Windows 10 enable preview of pictures, videos, folders and documents. This preview thumbnails are stored in the cache database, to enable a quick preview. As cache grows, there is possibility that something go wrong and this cache is damaged.
Reset of this database can be done on few ways.
Using Command prompt
- Open elevated command prompt
- run taskkill /f /im explorer.exe
- run del /f /s /q /a %LocalAppData%\Microsoft\Windows\Explorer\thumbcache_*.db
- run start explorer.exe
- close elevated command prompt
Using Disk Cleanup
- Open File Explorer
- On the right pane, right click on C: drive
- Select Properties
- Choose Disk Cleanup
- Select Thumbnails
- Click OK
- Click Delete Files
Also, check next
- In File Explorer select View > Options > View
- Check that option Always show icons, never thumbnails is not checked
