Okay, this will be a long one, but I'll try to cover all the info.

First, the PC info:

HP Pavillion M7650n with TV tuner

Processor: Intel Viiv Core2 Duo E6300 @ 1.86GHz
Ram: 2GB

Purchased December 2006 with Windows XP (free HP Express upgrade to Vista Home Premium (32bit) when available)

I think that covers the particulars on the PC. I received my upgrade discs, both the HP Upgrade Assistant, and the Vista Premium disc, in early March, but just upgraded last weekend.

Downloaded and ran the Microsoft upgrade advisor beforehand. The only task listed was to uninstall Norton Internet Security - Done.