Short story: Quadcore Vista machine (installed on SSD). Upgraded to Win7 x64 (dual boot - Win7 on Second SSD). BCD patched using EasyBCD like a year ago. My dad wanted to rearrange the drives in his machine. (Replace a 1TB mirror with a 2TB mirror, 2 new drives.)

Remove the Vista SSD, no more boot. Plug the Vista SSD back in, no more boot. Aw crap. Way too many apps and such to reinstall at this time, MAJOR problem. I'm looking to try to repair in place.

I did the instructions here using the Win7x64 Recovery Command Prompt and I created the missing BCD store on the Win7 SSD.

I tried both manual repair, and Nuclear Holocaust, but both had to be modified in some way...