iTunes also had user privs problems.

I think the way that I avoided all this was that my installation was NOT clean- it was an upgrade (despite all the objection from the holy saints, it runs remarkably fast). I have 2 accounts- originally one Power user/Admin (as they call it in XP) account, and one limited account.

I suggest this:
Booting into safe mode
Logging into admin
Make new account with AS MUCH privileges as possible
Restart, boot normally, log into new account
Install P7. Try XP compatibility too.

With you (almost) on top of the "privilege" chain, installing P7 would be smooth.

mike302de, http://downloads.guru3d.com/download.php?det=1559 is the current best driver for nVidia cards. You might need to copy the modified inf file and install manually through Device Manager, but everything after that is a breeze.

Yours seem to look like it was integrated into a nForce motherboard. Still, my advice for the 100.54 drivers are ALWAYS RUN IN AERO. They're finally good enough to support your system that way, and reverting back to old GUI had some devastating corruption on the screen that needed a restart.

Still, it works, and kicks the ass outta my imagination (I thought my FX5200 couldn't stand a chance with OPGL + Glass. It's like double suicide)

In This Twilight- My FIRST public poser work in 2 years!
Also the reason why I endorse postwork (:D)