Login with administrator privileges

[Ninjavenom]

So, i've been getting this error while trying to play games since i have had this PC. It's refurbished, so i expected a few problems, and this is only one of two snags i've run across, but it's a weird one. Every time i go to play a PC game (ROMs don't count), i get the Please Login With Administrator Privileges and Try Again error. I am the undisputed god and master of my PC, being not only the admin, but the only profile available besides the guest one. I renamed the Admin profile to Ninja, and as far i know the problem has started since then, but i can't really confirm that. It seems to happen with both cracked games, and games i legitimately have the discs for. In fact, outside of Unreal Tournament 2k4, i have had to use an .exe crack for every game i have tried to play on this mother. So that leaves me with a question: What gives? Any ideas, suggestions? Mutiple google searches turned up nothing useful to me, so maybe someone else has some kinda solution about this.