Windows failed to start. A recent hardware or software change... Bootcamp

Hello everyone, I really need help...
I have a MacPro, Snow leopard, BootCamp 3.1. I installed Windows Vista Ultimate on Bootcamp. I also use Vista home on Parallels 6 (this might be a factor, I don't know yet).
Everything was fine. After a few days, when I tried to start up my mac in Vista via Bootcamp, I get a black screen from windows (windows boot manager), telling me a recent hardware or software change might be the cause. File: \Boot\BCD Status:0xc000000f An error occurred while attempting to read the boot configuration data.
After that, the system freezes.
When I start back up in OS X, I open the BootCamp Drive... and nothing is on there. Unmounting and mounting doesn't help. Before I was able to see the files. The only way to repair is to delete and make a new partition. I have 3 HDDs so I decided to dedicate a complete single, physical drive to Windows. Same thing after 3 days. Programs I used under Mac OS X were Parallels, Dragon Age, Steam. But nothing which should write or delete the Windows Boot.
What is the problem, anyone else experiencing the problem? It is a pain, cause re-installing it every 4 days and updating it all takes half a day.

At this day and age, I'd dump Vista.
You can:
try safe boot
run sfc /scannow
restore to last restore point
rollback driver update
run chkdsk and attempt to fix bad blocks
boot from your Vista DVD and use System Repair features
run out and buy Windows 7 Pro x64
Ask Paralells forum
I have been using Windows 7 Beta, RC and release rock solid on Mac Pro and two PCs.
You tried Bing I hope. Quite good hits.
http://www.bing.com/search?q=Boot%5CBCD+Status%3A0xc000000f
There are currently two ways of repairing the Windows Vista bootloader:
1.With EasyBCD via the Diagnostics Section.
(Recommended, Easy to use and guaranteed results)
2.By booting from the Windows Vista DVD and using the recovery console.
(Use if you cannot boot into any version of Windows to use EasyBCD)

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