sending bug reports to Malfador?

[AgentZero]

For the rebooting issue, if you right click My Computer, click Properties, then the Advanced tab & click Settings in the Startup and Recovery box, then unticked the checkmark on Automatically Restart in the System failure box, you should get a Blue Screen Of Death instead of the computer just restarting. If, after doing that your machine still reboots itself, something wonky is going on.

As for Vista, consider the following. Vista will ship in 3 different flavours: Home Basic, Home Premium & Home Basic. Their minimum requirements?
Home Basic 800MHz Processor, 512MB RAM & DX9 complient video card.
Home Premium 1GHz Processor, 1GB RAM, DX9 complient video card with at least 128MB RAM, and 40GB HD capacity.
Ultimate Same as Premium

Keeping in mind that it's usually a safe bet you'll need 50-100% higher specs than the minimum to get optimal performance from any piece of software, and you're looking at an OS with similar system requirements to a next-gen FPS.
As far as I can tell, the reason Basic's requirements are so much lower is because it lacks the fancy Aero Glass functionality, but it's also missing a fair chunk of other options as well, so you'd have to take that into account when choosing which flavour to go with.

Personally, I'd be inclined to go with Ultimate for the same reason I'd rather run XP Pro: I'd rather have the extra features & not use them, rather than need the extra features & not have them. That being said, I'm going to hold off upgrading until someone comes out with a DX10-only game that I just have to play. But that probably won't be for at least another year or so, if not longer, at which point upgrading won't put such a dent in the ole pocket book either.