MY SOLUTION:
Remove 2G of the 4G memory. I remember when I installed Vista, the installation would balk with 4G RAM.
When I removed a couple sticks, it did fine. After the system stablized, I added the other two gigs. Three weeks and a lightening strike later, and since replacing the mb, for some undocumented reason, it hung up-so I did 6 repairs from the vista disc, always hanging on crcdisk.sys -- as soon as I pulled the 2G RAM, it booted Normally. I'm seeing some 'found new hardware' so I think my main problem is resolved.
Ah, but if it were that simple. Really needed to flash the BIOS as most every new motherboard purchased is "Vista" compatible, but only if you download from the manufacturer's site the correct BIOS update. It goes for the rest of the hardware, too.