A friends Media Centre PC was failing to boot with a message reported a problem with \Boot\BCD and address 0xc000000f. Not something that the non-technical person wants to see. The owner of the media centre is a technical person and he found one of the solutions - use the Vista Recovery Disk to repair and restart Vista. This procedure fixed the problem for the first reboot but it returned as soon as Windows Update installed something and restarted. And it repeated over and over again. I had used a tool called EasyBCD to modify the Vista boot loader and some googling produced the homepage for this utility and in the troubleshooting section there was a description of how to fix the very problem my friend was having. Solution one was the same as what had already been tried but there were several other solutions and the second one of these worked. Removing and recreating the Boot Loader data using EasyBCD fixed the problem. Check out EasyBCD and the solutions to Vista Boot Loader problems ...
Random thoughts and idle musings