Original post : Clear Thumbnails Cache - Guide for Windows XP, Vista, 7, 8, 8.1, 10.
Thumbs.db
disk cleanup
C:\
gpedit.msc
C:\Users\User\AppData\Local\Microsoft\Windows\Explorer
User
D:\
Anna
D:\Users\Anna\AppData\Local\Microsoft\Windows\Explorer
thumbcache
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
DisableThumbnailCache
1