You don't have SP1 installed right? As far as I know Microsoft cracked down a bit on WAT-related exploits on it.
I run RemoveWAT with MSE with no problems D; Try http://forums.mydigitallife.info/thr...fficial-Thread ?
RemoveWAT actually modifies system files. At least the old version did. Maybe the new one doesn't. Non-modification route it the way to go, whether it be BIOS or loader. Or so I hear.