Since its not an original piece of hardware that came with your HP, of course, you won't find the drivers for it at HP's website. As far as someone blaming Vista, thats stupid because its SMCs responsibility, not Microsoft's, to provide drivers for their hardware. There are no Vista drivers for it. You can fix that for $19.99, if you like the SMC brand, at Newegg.
http://www.newegg.com/Product/Product.aspx?Item=N82E16833129160
As you can see in the first review its compatible with Vista and if you look on SMC's site you will see it has Vista drivers:
http://www.smc.com/index.cfm?event=downloads.searchCriteria&localeCode=EN_USA&knowsPartNumber=false&productCategory=5&modelNumber=1599&partNumber=0&downloadType=1&os=0
I've run 64bit Ultimate since it first came out. It's come a long way since then, especially with the Service Pack 1. Nothing slow about it with the updates, Service Pack, you know how to tweak it, have adequate ram and hardware that isn't obsolete. A lot of people are still whining about issues that were fixed a long time ago. With all the updates and the Service Pack 1 Vista is pretty solid now compared to when it came out.
I doubt its your cpu giving you a BSOD. More like a driver issue. Suggest you look in the entry viewer and see if it has errors logged. Good way to troubleshoot. I'd also do all the Windows updates in and the Service Pack if you don't already have it in. I assume you formatted the drive then put Vista in? If you're running an SATA hard drive did you put the SATA drivers in during the install? Did you put in the .inf files that also installs SM bus controllers? Look in the device manager and see if you have anything tagged with yellow marks. If so, deal with them. Sounds like you may have missed something doing the install. Only way to figure out what it was is troubleshooting.
As far as what ITs have I'm in the business, know a few ITs and have worked with a lot of them. I bought a Mac just to be versed with OSX. I put Vista in as soon as it came out to be versed with Vista. Only way to learn an OS is to run it. ITs dont just run XP--they run everything. You don't learn how to swim reading a book. You gotta jump into the water.