Well... my last bit of advance kind of sucked. but there is another way. Not really any better than just a DoS, but you can go LAND attack on it. I don't think that ever got patched.

I was LAND attacking my coworkers at my last job when they pissed me off and they were all running XP SP2. (my admin didn't care, he didn't like those people either and i wasn't disrupting business)

It'll shoot their resources use up to 99% as long as you keep shooting packets at it. Probably won't help, but yea. I'd say mess around with the RDP too. see where you get. Sorry, I'm not much of a pen tester but I'm bored at work so you have to deal with my crappy advice.