del "Thumbs.db" file for clean your computer
1. Double Click in "My Computer choose Tools > Folder Options… " then Click Tab " View"
2. tick " Do not cache thumbnails "
3. in" Hidden files and folders" Click " Show hidden files and folders "Click OK
4. del Thumbs.db by Click "Start > Search > for Files or Folders.."
5. Click" All file and folders" Type " Thumbs.db " in "All or part of the name:" Click Search
6.Now You can Delete for Thumbs.db file