Space Rangers 2 Reboot won't load
 

I purchased and installed the Reboot expansion on Impulse, now the game won't load. It was working fine right before installing reboot. Now the screen just blinks once when I try to start the game. I uninstalled both versions and re-installed SR2. Once again it worked fine. Then I installed Reboot again and got the same results - just a quick blink and then nothing happens.

I'm running XP with a GeForce 7800 GS. The original SR2 is from D2D.