NTune Overclock Won't Stick

I overclocked my 9500GT a bit with nTune, and I know how to keep the settings, per se, but my problem is that a few seconds after I click the "accept" button, my screen turns a bluish-gray color and my computer becomes unresponsive until I shut it down with the power button. This also happens whenever I attempt to manually load a profile. Either way, the overclock doesn't stick. The overclock itself was stable, and I was able to play through all of Half-Life 2: Lost Coast at maximum settings and 1440 x 900 resolution with no artifacting whatsoever. I'm using the 190.38 drivers and version 5.05.54 of nTune on 32-bit Vista Home Premium. Another thing worth mentioning is that two "Unknown SEEPROM Device" errors before nTune starts up.

This seems like a stupid question, but my card is from XFX. Will it still work? As much as possible, I'd like to keep using nTune, I just need it to work properly.

I hear some Green tac and some paper clips and staples usually do the trick?

Precision works very nicely in fact, I used it alongside my XFX GTX275 for a while.

Had some issues with the overclocking, was my first time overclocking really and didn't get to a stable point. Decided to not do it now till I have done enough research and understand a whole bunch of things better.

What I didn't get though was that with having overclocked the card slightly(I didn't go nuts) I could play Fallout 3 at 1920x1080 highest settings with AA and Anistropic on through nVidia control panel (8x, 8x) no Issues, but when I switched to Crysis, dropping the nVidia control panel settings to application controlled, the game would crash after about an hour or so of playing.