After a virus infection or for some other reason, you may find that the icons on your desktop look jagged or with rough outlines. In 90% of the cases the following tweak will resolve that:

Find or create the followung registry entry: [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer]. You will have to create a new DWORD value called NoActiveDesktop, and set “NoActiveDesktop” to “1″ to disable Active Desktop (if you set NoActiveDesktop to “0″, this would keep Active Desktop active). To deactivate your Windows system’s Active Desktop for every user on the machine, you need to follow the same path but via HKEY_LOCAL_MACHINE. Synthesized description bellow: