"Windows did not actually run the file "reg_thumb.bat".I entered the Prompt as administrator through the cmd command, after running, I rebooted the computer and now the thumbnails appear.
So the file name I had to execute is…"
"You need to start a new thread meanwhile for the thumbnails not showing do this.
Make sure you're logged in as an Administrator.
In the start menu All Programs->Accessories right click in the command prompt and select Properties.