Ah ok, I get ya!
Thats one of the things I dont like about Vista, that and the change in direct3D for games.
Hence why I have an XP partition and a Vista one, for store room problems I had to decide on installing VSC++ Epress 08 onto vista as the sdks are pretty big; only little problem i've had with compiling is that sometimes it can't save the output file. I do like Vista, just a shame it was never given much of a chance, and M$ are bringing out the new one. I bought the Ultimate Edition, but that was a waste the ultimate extras where very thin on the ground and too few to mention.
So im either going to run the cmd prompt as administrator ( why it isnt I dont know as I am logged in as the administrator ), or do it when im on XP.