Symptom & Diagnose
When you login to pc with domain, then you find your desktop was not like before, there was no other background except null and white and you find one button in the middle of screen, then you are no doubt having the Active Desktop Issue.
Go to registry( start->run->type regedit (do not include type when you are typing on run)) and edit at these path
Then,what you do is to change the value of DeskHtmlVersion from 272 to 0. Close everything and on the desktop again press F5 for refreshing it. You will find your desktop display as per normal