Win7 is really nice and solid, but not really necessary for most trading systems. Just reinstall XP 32-bit. It'll be able to utilize about 3.5GB RAM. If your trading apps require 4GB or more RAM, then go with the 64-bit version.
On Mar 10, 2000, when Nasdaq was at 5048, the trend made the mistake of calling Chuck Norris friend. He roundkicked Nasdaq's ass all the way down to 1300.
I was able to run QuoteTracker by using Wine on Ubuntu 7.04. It installed & ran ok but I couldn't get the IQFeed client to run under Wine. I didn't try to use IB as the datasource but it might just work.
Meanwhile, still using WinXP & waiting patiently for a Linux RT charting option.