I believe you could do either one of two things here too,,
1) use the rollback feature in XP to restore your system to a date prior to the change of drivers,,
2) delete the card, uninstall the drivers, reboot, let the machine find the card, and use the detonator 43.45 drivers as Devilish suggests,,
I have a GF4 Mx440 ,, and went through a similiar exercise,, the 43.45 drivers did the trick for me though,,
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