:mad: after being infected by trojan "download trojan".
My display property "desktop" function is being disable. It only show the message "spyware infection" when I wanted to change the background of my display from the desktop function I just cannot change the browse function is disable.

I had already fix the trojan, is there a way to fix the display problem problem other then reformatting the system.

Sounds like the dreaded WMF exploit. Check out this page:
http://www.politicalgateway.com/news/read.html?id=5722