Here is how I got the Coolbits reg to work in this 12.41 driver now:
1. Make sure the Display Properties window is CLOSED.
2. Insert the nVCpl.dll from an older set of detonator drivers ( I used the file from 12.00 driver) into C:WINNT\SYSTEM32 (I am using win2k), and click YES when asked to over write the current file.
3. Use the Cool Bits hack like normal, reboot, click Enable Clock Frequency Adjustments in [H]ardware Options, reboot again.
Voila now I got it back to 205/205 for my GF2 MX