Refresh Rate

How can I change my refresh rate in Half Life CS ?

My problem is: my refresh rate in win2k is 85 hz, but when I play CS, my monitor automatically switches back to 60 hz => my max fps will be 60 hz

yes i know i can turn off V-sync, but it seems that my fps is higher, but I won’t feel it in the game…

So, does anyone know how I can have a refresh rate of 85 hz in CS?

I have a GeForce 2 MX and win2k

thnx