I was. Turns out there is a bug with nForce motherboard chipsets.
I installed http://support.microsoft.com/kb/930261, even though my error blue screen was happening at crcdisk.dll loading, and now I can upgrade to 4 GB.
This is a long overdue upgrade that I have put off for the last 2 years. There is no personal reason why I need such a grunty personal computer, I need it for my job. Seems that many of my colleagues have also had to purchase personal hardware just to get their jobs done. Kind of sucks, but I need to keep up with technology to do my job.
Virtual server is about the only application I need to run so Vista will be replaced with Longhorn server very shortly. I just wanted to see what Vista looked like on some decent hardware compared to my Toshiba M4 laptop which is sub-optimal for the work I do.
Speaking of work, the biggest challenge I'm finding at the moment is working on SPS 2003 and MOSS 2007 projects at the same time.