Thanks for all the info. I looked all over at vixenlights and gave up... That is exactly what I wanted!
The pc I have in mind is old but not a dinosaur. It still specs out ok although it is Win98. The .NET minimum specs appear to be a good baseline. I am probably going to erase the hard drive and reinstall OS, .Net, vixen, etc.
I am not on the bleeding edge of this blinky thing. You guys and your 1000 channels! I am happy to stay under 100 channels for a while and tinker with some SS this year. I agree you'll need processing power for the rgb thing, but I will wait patiently to learn vixen 3.0 if it is launched.