1st of all go to

1. start

2. all programs

3. accessories

4. notepad

then paste the below code in notepad.

[ExtShellFolderViews]
{BE098140-A513-11D0-A3A4-00C04FD706EC}={BE098140-A513-11D0-A3A4-00C04FD706EC}
[{BE098140-A513-11D0-A3A4-00C04FD706EC}]
Attributes=1
IconArea_Image= background image

you have to edit the text "background image" by your image name. It may be pendrive.jpg.

Now save this file as "desktop.ini"

Then this file and the image keep in your pendrive. You can hide this two file for your security. and refresh or reenter your drive.

Thanks.