XP isn't even supported by Microsoft any more.. I understand your frustration but at some point the latest and greatest software will not run on "older" unsupported operating systems..
When I finally upgraded from Guitar Studio 2.0 to Sonar 8.5, I bought a new desktop computer running W7 and a new soundcard. It wasn't free but these days, not
that expensive (everything being relative of course)..
I hope you'll be in a position to upgrade your computer soon!