How To Delete Windows 7
- Uninstall Windows 7
- How To Delete Windows 7 Ultimate
- How To Delete Windows 7 Password
- How To Delete Windows 7 Profile
- How To Delete Windows 10
How to delete or uninstall Windows 10, Windows 7, or Windows 8 from your PC. How to remove Windows when using multiple operating systems, including when using Ubuntu Linux. When a Windows 7 user account is no longer needed on your home network, you can delete the user account from your computer or network. You cannot delete the account that you are currently logged in as, and you must be an administrator. Also, at least one Administrator account must remain (meaning you cannot delete. SDelete is a command line utility that takes a number of options. In any given use, it allows you to delete one or more files and/or directories, or to cleanse the free space on a logical disk. SDelete accepts wild card characters as part of the directory or file specifier. Usage: sdelete -p passes -s -q. Remove the boot entry for the Windows version that you want to remove. It is time to remove the boot entry for the Windows operating system that you want to remove. In our example, that is Windows 7. Do this from the version of Windows that you want to keep. For us, that is Windows 10.
May 15, 2019 A clean install of Windows is accomplished during the Windows setup process by removing the existing Windows installation (assuming there is one) before installing a new operating system or reinstalling the existing one. Note: In Windows 10, the Reset This PC process is an easier-to-do, and equally effective, way to clean reinstall Windows. Go Back to Windows 7 or 8.1. If you’ve upgraded a PC to Windows 10—not performed a clean install, but an upgrade—you have an easy option that lets you revert to the last version of Windows. To access this, hit Windows+I to open the Settings app, click the “Update &.
-->By Mark Russinovich
Published: December 11, 2018
Download SDelete(221 KB)
Introduction
One feature of Windows NT/2000's (Win2K) C2-compliance is that itimplements object reuse protection. This means that when an applicationallocates file space or virtual memory it is unable to view data thatwas previously stored in the resources Windows NT/2K allocates for it.Windows NT zero-fills memory and zeroes the sectors on disk where a fileis placed before it presents either type of resource to an application.However, object reuse does not dictate that the space that a fileoccupies before it is deleted be zeroed. This is because Windows NT/2Kis designed with the assumption that the operating system controlsaccess to system resources. However, when the operating system is notactive it is possible to use raw disk editors and recovery tools to viewand recover data that the operating system has deallocated. Even whenyou encrypt files with Win2K's Encrypting File System (EFS), a file'soriginal unencrypted file data is left on the disk after a new encryptedversion of the file is created.
The only way to ensure that deleted files, as well as files that youencrypt with EFS, are safe from recovery is to use a secure deleteapplication. Secure delete applications overwrite a deleted file'son-disk data using techiques that are shown to make disk dataunrecoverable, even using recovery technology that can read patterns inmagnetic media that reveal weakly deleted files. SDelete (SecureDelete) is such an application. You can use SDelete both to securelydelete existing files, as well as to securely erase any file data thatexists in the unallocated portions of a disk (including files that youhave already deleted or encrypted). SDelete implements the Departmentof Defense clearing and sanitizing standard DOD 5220.22-M, to give youconfidence that once deleted with SDelete, your file data is goneforever. Note that SDelete securely deletes file data, but not filenames located in free disk space.
Using SDelete
SDelete is a command line utility that takes a number of options. Inany given use, it allows you to delete one or more files and/ordirectories, or to cleanse the free space on a logical disk. SDeleteaccepts wild card characters as part of the directory or file specifier.
Usage: sdelete [-p passes] [-s] [-q] <file or directory>..
sdelete [-p passes] [-z -c] [drive letter] ..
| Parameter | Description |
|---|---|
| -a | Remove Read-Only attribute. |
| -c | Clean free space. |
| -p passes | Specifies number of overwrite passes (default is 1). |
| -q | Don't print errors (Quiet). |
| -s or -r | Recurse subdirectories. |
| -z | Zero free space (good for virtual disk optimization). |
Uninstall Windows 7
How SDelete Works
Securely deleting a file that has no special attributes is relativelystraight-forward: the secure delete program simply overwrites the filewith the secure delete pattern. What is more tricky is securely deletingWindows NT/2K compressed, encrypted and sparse files, and securelycleansing disk free spaces.
Compressed, encrypted and sparse are managed by NTFS in 16-clusterblocks. If a program writes to an existing portion of such a file NTFSallocates new space on the disk to store the new data and after the newdata has been written, deallocates the clusters previously occupied bythe file. NTFS takes this conservative approach for reasons related todata integrity, and in the case of compressed and sparse files, in casea new allocation is larger than what exists (the new compressed data isbigger than the old compressed data). Thus, overwriting such a file willnot succeed in deleting the file's contents from the disk.
To handle these types of files SDelete relies on the defragmentationAPI. Using the defragmentation API, SDelete can determine preciselywhich clusters on a disk are occupied by data belonging to compressed,sparse and encrypted files. Once SDelete knows which clusters containthe file's data, it can open the disk for raw access and overwrite thoseclusters.
Cleaning free space presents another challenge. Since FAT and NTFSprovide no means for an application to directly address free space,SDelete has one of two options. The first is that it can, like it doesfor compressed, sparse and encrypted files, open the disk for raw accessand overwrite the free space. This approach suffers from a big problem:even if SDelete were coded to be fully capable of calculating the freespace portions of NTFS and FAT drives (something that's not trivial), itwould run the risk of collision with active file operations taking placeon the system. For example, say SDelete determines that a cluster isfree, and just at that moment the file system driver (FAT, NTFS) decidesto allocate the cluster for a file that another application ismodifying. The file system driver writes the new data to the cluster,and then SDelete comes along and overwrites the freshly written data:the file's new data is gone. The problem is even worse if the cluster isallocated for file system metadata since SDelete will corrupt the filesystem's on-disk structures.
The second approach, and the one SDelete takes, is to indirectlyoverwrite free space. First, SDelete allocates the largest file itcan. SDelete does this using non-cached file I/O so that the contentsof the NT file system cache will not be thrown out and replaced withuseless data associated with SDelete's space-hogging file. Becausenon-cached file I/O must be sector (512-byte) aligned, there might besome left over space that isn't allocated for the SDelete file evenwhen SDelete cannot further grow the file. To grab any remaining spaceSDelete next allocates the largest cached file it can. For both ofthese files SDelete performs a secure overwrite, ensuring that all thedisk space that was previously free becomes securely cleansed.
On NTFS drives SDelete's job isn't necessarily through after itallocates and overwrites the two files. SDelete must also fill anyexisting free portions of the NTFS MFT (Master File Table) with filesthat fit within an MFT record. An MFT record is typically 1KB in size,and every file or directory on a disk requires at least one MFT record.Small files are stored entirely within their MFT record, while filesthat don't fit within a record are allocated clusters outside the MFT.All SDelete has to do to take care of the free MFT space is allocatethe largest file it can - when the file occupies all the available spacein an MFT Record NTFS will prevent the file from getting larger, sincethere are no free clusters left on the disk (they are being held by thetwo files SDelete previously allocated). SDelete then repeats theprocess. When SDelete can no longer even create a new file, it knowsthat all the previously free records in the MFT have been completelyfilled with securely overwritten files.
To overwrite file names of a file that you delete, SDelete renames thefile 26 times, each time replacing each character of the file's namewith a successive alphabetic character. For instance, the first renameof 'foo.txt' would be to 'AAA.AAA'.
The reason that SDelete does not securely delete file names whencleaning disk free space is that deleting them would require directmanipulation of directory structures. Directory structures can have freespace containing deleted file names, but the free directory space is notavailable for allocation to other files. Hence, SDelete has no way ofallocating this free space so that it can securely overwrite it.
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Download SDelete(151 KB)
Runs on:
- Client: Windows Vista and higher
- Server: Windows Server 2008 and higher
- Nano Server: 2016 and higher
How To Delete Windows 7 Ultimate
Now that you've upgraded to Windows 10 and are ready to embrace Microsoft's computing future, you can free up valuable space on your drive for new files.
To do this, you can clean up your disk using the Disk Cleanup utility on Windows to remove old files, temporary internet files and empty out that overflying Recycle Bin. One of the biggest files that you can remove is your previous Windows installation.
Bear in mind that doing this means that you'll forever say 'I do' to Cortana, for better or for worse, and that there is no going back to the past.
I would only recommend doing this after a month of using Windows 10. During your first month, Windows 10 is your friend with benefits – you'll get to enjoy Cortana, a new Start experience, more ways to multitask, Microsoft Edge, Continuum and the Action Center without fully having to commit. If you don't see a future with Windows 10, you can always rollback to your previous Windows install during this first month.
However, if it's love at first sight, let's proceed.
Scrub everything clean
You can launch Disk Cleanup through the Cortana search bar by typing in 'Disk Cleanup' and selecting it from the list of results. As a digital assistant in Windows 10, Cortana can search local and OneDrive files, lookup content on the internet and retrieve your apps and settings.
Under the Disk Cleanup tab, you can select all the temporary files and begin cleaning up your digital clutter.
How To Delete Windows 7 Password
To free up space from your old Windows installation files, you can click on the 'Clean up system files' button on the lower left. You'll be asked to select which drive partition for Windows to examine. I chose the 'OS (C:)' drive.
How To Delete Windows 7 Profile
Windows will scan your system, and repopulate the list of files to delete. You'll now be able to see 'Previous Windows installation(s)' as an option in that list.
In my case, that amounted to 16.7GB that I was able to reclaim, but this will vary from system to system.
How to rollback in the future
Once you remove your previous Windows installation files, you won't be able to recover your system to the point just prior to your upgrade to Windows 10. However, there are still ways to get back to the version of Windows prior to your Windows 10 install.
How To Delete Windows 10
If your system shipped with recovery media like a DVD that contains the operating system, pre-installed software and the necessary drivers, you can use that to recover your system.
If you made a recovery media prior to upgrading to Windows 10, you can use that to downgrade in the future. A recovery media is similar to the DVD that shipped on older systems. You can create a recovery media on Windows 7, 8 or 8.1 by using a USB drive or a DVD, but you'll need to do that prior to upgrading to Windows 10.
If you already upgraded to Windows 10 but don't have any recovery media available, there are two options you can take.
The first option is to immediately downgrade to your old version of Windows. You can do this by going to Settings, selecting Update and Security and going to Recovery. You'll need to be plugged into a power source, and Windows 10 makes it painlessly easy to downgrade.
Once you downgrade, you can create your own recovery media, and then upgrade again. It's always a safe Plan B to have a recovery media on hand.
The second option is to call your manufacturer. If you bought a notebook from Dell, HP Lenovo or any of the leading manufacturers, you can pay to have recovery media shipped to you. This route will cost you a little bit of money, but it will save you the hassle of having to downgrade just to upgrade again.
Cautions
If you're looking to downgrade using recovery media in the future, you'll also need to back up your personal files. Likely, the recovery media will just wipe your system to install a factory image. This means the result you end up with will be a fresh copy of Windows 7, 8 or 8.1, like when you first powered on your PC when you took it out of the box.
Downgrading within a month through the Windows 10 recovery option will preserve your personal files, but you only have a month to do so.
- Read our Windows 10 review