The guy in that thread, and you probably, need to run as administrator. He said he was, but then he got errors indicating he wasn't.
In fact, fix all your problems easily:
1. Hit the windows button on your keyboard
2. Type in UAC and press enter
3. Move that slider to Never notify.
You have now turned off all that privileges nonsense and everything will work fine. Though now your computer is at risk of you doing stupid things to it. But no more so that XP. So don't do stupid things to it and you'll be fine.