Remove Thumb.db file!!!

Thumb.db is is a cache of the current picture in that directory.Anytime thumbnails view is enabled or has been enabled in Microsoft Windows the hidden file thumbs.db is automatically created in the same directory as where the thumbnails have been viewed. This file contains the information required by Windows to display the thumbnails for each of the icons and will be placed in every folder thumbnails are viewed.
Law-enforcement agencies have used this file to prove that illicit photos were previously stored on the hard drive

To remove it go for following

1 ) open "WINDOWS EXPLORER".

2)go to "TOOLS".

3)open "FOLDER OPTIONS".

4)go to "VIEW".

5)see 1st section "FILES & FOLDERS".

6)click on the "DO NOT CACHE THUMBNAILS".

now the thumbnail file will be removed from your computer once u do this the file will be never created.