You're running your server on Windows Vista arencha? Don't worry, that error doesn't mean you need to put your computer up on cinder blocks or on the second floor, as some may suspect. Chances are if you're running Vista, you just need to turn off the damned UAC, which should never have been turned on in the first place... didja know somebody at MS actually admitted they added that to Vista to annoy the shit out of people? Because apparently if you annoy the crap outta people, they don't try and mess with sensitive system settings.... OR... they buy a Mac. Dumba**es.

Anywho. You can turn UAC off by running msconfig, hopping over to the tools tab, and selecting the Disable UAC option. It'll make your life much happier all in all even if this isn't your problem.
-m