>It's a system protection method. If you had full rights and malware got into the system, it too could get full rights and cause all kinds of problems.

I am the administrator of that PC so I want to control what's on the C: drive. This would seem to be a logical thing to do. I want to work with this PC and, lucky me, if I wouldn't have created a VHD for a D: drive, I wouldn't have been able to do anything so far on that PC.