I played it, but I cannot remember how to change the res. The game got incredibly agitating after a while (because of the "combat mode") so I stopped playing.

Anyway you could try to fix the refresh with some utility like Ati tray tool (ATI) or equivalent for nvidia. After all, you could try dxdiag:

Start->run  "dxdiag"
click "more help" tab and then click "Override". Type in the value that is supported by the monitor (75/85Hz for example) for the resolution that is going to be used.

Watch out, do not forget to change it back when you are done playing, for some other game may start at a higher resolution and may try to use the refresh rate that the monitor is not capable of. Let's say you force the 120Hz refresh for a game that runs in 640x480 and then start a game that starts in 1600x1200...