Forum Discussion
Valentinasop
Sep 10, 2025Silver Contributor
How to free or clean up disk space on windows 10?
My primary drive (C:) is running very low on space, which is causing slowdowns. I've already deleted my own personal files that I don't need. I'm familiar with the basic "Disk Cleanup" tool and have ...
Castiellm
Sep 10, 2025Iron Contributor
Insufficient space on the C drive is a common cause of slow computer performance, as the Windows system requires free space to store temporary files, virtual memory, and perform system operations. Since you've already used basic disk cleanup tools and managed personal files, it's time to adopt more advanced and effective methods.
- Press the Windows key, type Disk Cleanup, and click to open the Disk Cleanup app.
- Select the C drive from the dropdown list and click OK.
- Click the Clean up system files button. You'll be prompted for administrator permissions—confirm as instructed.
- Select the C drive again. A list of files across more categories will now appear.
- Check the boxes for the following file categories that can be safely deleted:
- Windows Update cleanup ☑️
- Transit optimization files ☑️
- Windows upgrade log files ☑️
- Temporary Windows installation files ☑️
- Previous Windows installations: ☑️
Click OK, then click Delete files to complete the cleanup.
This kind of cleaning up disk space on Windows 10 is guaranteed to be safe and will not accidentally delete important files, but the overall time consuming will be a little bit longer, so be patient and you will have a new experience!