System Hang Problem

Anybody ever have a problem with SE5 hanging at the “processing after all player turns” part of the game. I am running ver 1.66 using balance mod v1.12. It happened well into the game, initially I thought the PC couldn’t handle the game – 3.0Gb Intel CPU, 2Gb DDR400 Ram, Invidia GForce FX550 AGP vid card running Vista Ultimate. But I tried new game – standard SE5 and it did the same thing at the end of the first turn, using a small galaxy and only 3 AI players + myself. Sounds like the SE5 app is screwed to me. But before I reinstall, I thought I’d check it out with you guys. Any help or advice would be appreciated. Cheers