Hmmm... unable to exit the game? Wish I had that problem. That way when my wife tells me to "turn it off" I can say "I can't!" and continue playing. But seriously though, I don't think <Ctrl>+<Alt>+<Del> works when in MTW. I've tried it several times (active game or frozen) and it's always a no-go. The only system key I've noticed that works is the Windows key, which takes you out of the game (while it's still running) and back to your desktop. I can't even tell you how often I've accidently hit that doggone thing instead of <Ctr> while in the heat of battle. One of these days I'm going to get the pliers and yank that dude from my keyboard!

Anyway, what kind of graphics card are you using in your new system?