You've run into a common problem and the reason why no one should ever go with a 64-bit OS unless they do their homework first and know they have working 64-bit drivers for ALL their hardware.

This is especially true with laptops where the use of proprietary parts are common. And this is not limited to Windows, but all 64-bit operating systems.
Your best bet is to contact Everest - or find the maker of your card and contact them. I note that Hardforum post you referred to is 68 pages long - you might want to scan through that, or post your concerns there as someone might have run into the same problem and can help.
Sorry I could not be of more help. Keep us posted.