Few methods:
1. Run cleanmgr as administrator. Click Win key, type in “cleanmgr”, right click on it and choose run as administrator.
2. Run storage and remove unnecessary files. Click Win, type in “storage”.
3. Manually remove temp files as following:
Step 1
Press Windows key + R
Type temp and click OK
Press Ctrl + A and click Delete
Step 2
Press Windows key + R
Type %temp% and click OK
Press Ctrl + A and click Delete
Step 3
Press Windows key + R
Type prefetch and click OK
Press Ctrl + A and click Delete
4. Download CCleaner and run it!
5. Use SpaceSniffer or WinDirStat to inspect and get rid of whatever you don’t need.