Until I installed the Fall of the Samurai expansion, I haven't had too many problems with Shogun 2. After a long play session, the game would crash occasionally. Now it crashes every time I play sometimes after only a few minutes. I have all the latest drivers and Windows updates and I benchmark the game at 45 fps so I don't have my settings cranked too high.
I am running Windows 7 Home Premium 32-bit
Geforce 8800 GTX 768MB
Pentium II dual-core 3.0 ghz
4 GB of RAM (3 GB usable)
300 GB of free hard disk space