S3 savage 2000 card Xp?Xp?Xp?

I have a s3 savage 2000 and i play about more then 1 1/2 year counter-strike about one month ago i bought winxp but my card doesnt work anymore properly with counter-strike and rtcw the problem is with counter-strike i can play but when i jump in the water (de_boatseason2c) or i exit the game with esc my computer reboots out itself and with rtcw it just doesnt work so i went to go to s3grapichs.com looking for a new driver but the newest didnt work my computer needed to reboot all the time so plz help me with this i hope you can support me