A blog report about Mac Parallel Desktop
I took the liberty to do research since I wasnt that busy today
so here's what I find and what this might be helpful
or get the idea.
have a safe independence day!

:rl:
the link here :
Vista on Intel Mac With Parallels: Not Quite There - Gizmodo
Software
Vista on Intel Mac With Parallels: Not Quite There
http://i186.photobucket.com/albums/x142/shadowfeather007/vistamac1.png
vistamac1.pngAfter seeing how the Mac Pro ran Microsoft Vista better than OS X, we wondered how well the best of both worlds worked. Namely, using Parallels to run Vista alongside OS X. So we installed Vista using Parallels on our 15-inch, 2.33 GHz Core 2 Duo MacBook Pro.
The good news is it did work, but the bad news is it didn't work very well.
Compared to Windows XP support, Vista support in Parallels is still quite developmental. It installed fine, sure, but you didn't get the fancy Aero graphics even in Vista Ultimate thanks to Parallel's lacking support in the graphics card area.
shadowfeather007 - Photobucket - Video and Image Hosting
vistamac3.pngWe also wanted to compare the Windows Experience Index score to our not-quite-as-expensive desktop. Unfortunately the scorer never completed and gave us an error message that said something about the driver. Darn.
Also, we couldn't get the networking up. That's kind of an important piece. However, the rest of the stuff was working just fine, just without networking or Aero.
When Parallels updates their Beta, we'll be sure to report back on their progress. – Jason Chen
Product Page [Parallels]