I don't speak english very well, so I'll cut it short:The game dosen't start

Error message:

We were unable to initialize the game's graphical display. Please take the following steps to ensure compatibility:
Visit the technical support forum for up-to-date information and suggestions.
Make sure your system satisfies the game's minimum requirements.
Update your video drivers.
Ensure that hardware video acceleration is fully enabled.

My system performance:
PC:
Intel celeron 2.40 Ghz
2,50 GB RAM
Ati radeon 9600

laptop:
IBM T60:
Intel core duo T2400 1,83 Ghz
3 GB RAM
Mobile intel 945 Express

( I know it's an old system)

I've spent more than 700 hours with the game without having problems. I'd like to ask how can I change my settings outside of the game, I think it might help. Thank you!