I don't advise turning of UAC, it may be annoying but it does provide an extra layer of security to a system.
Windows by default virtualizes following directories: Windows, Program files on 32 bit systems and on 64 bit Program Files x86 and Program files. One can manually remove restrictions from Program files while still having UAC turned on as UAC relies on ACL of a folder this also means that you can manually virtualize any folder.
UAC in itself is not magic, folders like Windows and Program files simply do not allow write permissions for the user group but for administrators only so the folders are therefore virtualized.
Edit:
care to explain UAC...maybe in a different thread?
Up to this point everyone was on topic as the way I see it people were giving general pointers to the richmuaddib on how to deal with UAC. However this topic does belong to tech support.
*Moved*