Start with the built-in tools: Storage Sense and Disk Cleanup remove temporary files and old update files safely. Then look at large personal folders like Downloads and Desktop, and use OneDrive Files On-Demand so files are stored in the cloud until you need them.
Common causes
Temporary and update files
Old Windows update files and temporary files can take many gigabytes.
Downloads and desktop files
Large installers, videos, and old files accumulate over years.
Synced cloud folders
OneDrive, Dropbox, or SharePoint files set to always keep on device use local space.
Small drive
Computers with 128 GB or 256 GB drives fill up quickly with modern software.
How to fix it, step by step
- 1
Run Storage Sense
Go to Settings > System > Storage and use Cleanup recommendations or turn on Storage Sense.
- 2
Run Disk Cleanup for system files
Search for Disk Cleanup, choose "Clean up system files", and remove Windows Update Cleanup and temporary files.
- 3
Clean out Downloads
Delete installers and files you no longer need.
- 4
Use OneDrive Files On-Demand
Right-click synced folders and choose "Free up space" to keep files online only.
- 5
Uninstall unused programs
Remove software you no longer use from Settings > Apps.
When to call a technician
Never delete files from the Windows folder manually. If cleanup isn't enough, we can upgrade the drive and copy everything over so nothing is lost.
On-site support across Orange County · see our IT support, managed IT, Microsoft 365 support and cybersecurity services.
Frequently asked questions
Is it safe to delete files in the Windows folder?
No. Use Disk Cleanup or Storage Sense instead. Deleting Windows files manually can stop the computer from starting.
How much free space should I keep?
Keep at least 15–20% of the drive free so Windows and updates work properly.
Can I move files to the cloud to save space?
Yes. OneDrive Files On-Demand keeps files in the cloud and downloads them only when you open them.