Use Windows Storage settings to see what occupies the system drive, then remove files and apps you recognize. Review every cleanup category before confirming deletion, especially Downloads, Recycle Bin and previous Windows installations.
Deletion may be permanent. Confirm a separate working backup before removing personal files. Deleting a file inside a synced cloud folder may also delete its cloud copy and copies on other devices.
Measure the problem first
Open Settings > System > Storage. Let Windows calculate the categories and check which drive is short of space. A large secondary drive does not help an update if the Windows drive is full.
Look for the largest category rather than starting with tiny files. Apps, videos, downloaded installers and local cloud copies are more useful places to investigate than unfamiliar system folders. There is no single free-space percentage that guarantees every update will fit.
Review Windows cleanup options
Windows 11 provides Cleanup recommendations and Temporary files within Storage. Available categories depend on the machine and recent updates.
- Save work and close apps that may be creating temporary files.
- Open a cleanup category and read its description before selecting it.
- Review Downloads manually. It may contain documents or installers you still need. Do not assume it is disposable because it appears near temporary-file options.
- Check the Recycle Bin for anything you want to restore before emptying it.
- Only remove a previous Windows installation if you accept losing the built-in ability to go back using those installation files.
Remove or move large personal files
In File Explorer, review familiar folders such as Downloads, Videos and Desktop. Sort a folder by Size where available, or inspect large files individually. Open a file when you are unsure what it contains.
For files you want to keep, copy them to a suitable external drive, verify several copied files open, and only then delete the originals. A move to an external drive is not a backup if it leaves you with just one copy.
Avoid moving installed application folders manually. That can break shortcuts and updates. Uninstall an application through Settings, or use the application’s documented storage-location setting. Check game saves and license details before removing a large game or editor.
Handle cloud storage deliberately
A synced file and a local-only file behave differently. Before using an online-only or “free up space” command, confirm the upload completed and that you can access the file through the correct cloud account.
Online-only files need a connection to download again. Keep essential travel documents or work files available offline when you need them away from reliable internet. Never use the Delete command as a substitute for a provider’s documented local-space-saving option.
Review Storage Sense settings before enabling automatic cleanup. Understand whether it will empty the Recycle Bin, remove older Downloads or make supported cloud content online-only. Choose conservative settings if several people use the computer.
If space disappears again
Note the free space immediately after cleanup and compare it the next day. A rapidly growing folder may belong to a backup, recording app, sync client or malfunctioning application. Investigate the owner rather than repeatedly deleting unfamiliar files.
Do not manually remove WinSxS, Windows Installer, recovery partitions or files in the Windows directory. Built-in cleanup tools understand dependencies that a general file browser cannot explain.
If Windows Update requests more room, follow its specific instructions; some updates can use external storage for part of the process. If ordinary documents already fill the drive, consider a larger compatible drive or a deliberate storage plan instead of endless cleanup.
Sources and further help
Official documentation used to check the guidance. Menu names and options can vary by device and software version.