FSX is forcing me into Vista.

Okay, so after going through all the trouble of downlaoding and installing FSX I go to play and get this error.
"MSXML4 SP2 Cannot be found. Please reinstall FS to fix this error."
So I go ahead and reinstall it, however I still get the same error message. And whats the first thing I think of? Google! I find the answer I'm looking for on Microsoft.com and try to reinstall the MSXML but to no avail. Running out of thoughts I try one last thing, boot up Vista, and install it there.....and YES!!! it works. But heres the downside, I only get 10~12 FPS. Which is flyable, but not when I get 60+ in FS9.
So my question to you is did any of you have a similar problem and how did you fix it. Cus I mean as much as I love useing Vista as my only OS, I really can't stand 12FPS.
Cheers
Cameron
"MSXML4 SP2 Cannot be found. Please reinstall FS to fix this error."
So I go ahead and reinstall it, however I still get the same error message. And whats the first thing I think of? Google! I find the answer I'm looking for on Microsoft.com and try to reinstall the MSXML but to no avail. Running out of thoughts I try one last thing, boot up Vista, and install it there.....and YES!!! it works. But heres the downside, I only get 10~12 FPS. Which is flyable, but not when I get 60+ in FS9.
So my question to you is did any of you have a similar problem and how did you fix it. Cus I mean as much as I love useing Vista as my only OS, I really can't stand 12FPS.
Cheers
Cameron