I've just managed 2 get rid of this trojan, but I still have problems with my display properties. When I try to change my wallpaper to its previous state, when I go to the browse section there's only the BMP(bitmap) option in the Files of type entry, where's the Jpeg ,gif, ... all files option ?!

I can't figure it out.... .I looked in regedit in Hkey Current user-Software-Microsoft-Windows-Policies & there's no System registry key.This goes as well for Hkey local machine- Software-Microsoft-Windows-Policies. Can anyone please tell me how can I fix this nagging issue?