Help! (yes another of these...)

I have a Gigabyte S3 Rev 1.0. Today I tried updating my Xt1650 Radeon Drivers to the latest version, but when it went to restart the system simply sat there. From windows to a black screen of death.

Eventually I hardbooted the computer, which of course wipes out my overclock. I went to reset everything, but instead of working, the system failed to POST. I am using the same settings as before: 266 FSB with 9 mutilpier, RAM at 1:1, graphics card set to 100 megahertz, and voltage adjusted to 1.35. Nothing else. All those creepy little things in BIOS? Disabled.

Still no post. I am writing this from that computer, just at factory settings.

Anyone know whats wrong? Have any advice?

Also, when I re-update to F9 BIOS, in My Documents I suddenly get a CW.ERR file. Whats this?

UPDATE: It posted at 266 again. But now I have all the overvoltage controls set to +.1, which I did not have before. And funny thing is, that when I boot up it still says its an F7 BIOS on the start screen.
?
Even though I just put in F9, could it be that the CW.ERR file is actually an error stating that F9 was not put in?

RAM is a set of G.Skill at 2 gigs, running at 533 megahertz (although it could very well run up to 800 since its DDR2-800), and the processor is a E4300 now clocked at 266.
Vcore: 1.35
All settings in BIOS except memory overvoltage are set to +.1

I think I'd like to back down on all but the GPU overvoltage, as really, when this graphics card finally dies, I do desire to replace it (in fact that sooner it dies the better).