You're running Win XP so you don't have UAC.
The problem I think is that your video card, it's not supported.
Even though it has the features required, your particular model is not listed as being supported.
http://forums.ubi.com/showthread.php...rements-Forums
You need a fairly beefy system to run this sim and yours is way down the line in terms of grunt. I'd suggest upgrading if you want fly seriously.