I use both BYO and manufactured PC's, and I have very few problems with Vegas 11 on any of them. I prefer the BYO computers because of two issues. First the manufactured PC's usually lock areas of the BIOS that inhibits any hardware upgrades, and second, I have experienced
more software problems on manufactured PC's (HP, e-machines, Dell) than any of my BYO's.
Also, the O/S that comes bundled with the manufactured PC is so loaded with crapware, some of which cause problems with Vegas, that the first thing you want to do is replace the O/S with a clean install. Which means buying another copy of Windows. Which also means voiding your warranty. Which is mostly worthless anyway since their idea of repairing the PC is to restore the O/S to the as-shipped image.
Steve Mann
MannMade Digital Video
http://www.mmdv.com