Vista RTM Install Issue

Alright, this is kind of a lengthy issue but I'm trying to give as much
background as possible to my problem.

I had Vista RC1 installed on a second partition on the same drive (raid 0, 2
300Gb maxtors on a NVRAID chipset) as a XP install, the RC1 worked fine for
me and I enjoyed playing with it.

I installed Vista RTM which was given to me to test some features of my DX10
video card and I wasn't paying attention to it very well and I clicked past
the key portion and it went to the 30 day trial until activation, I had also
selected the wrong version of windows for the install.

I then attempted to reinstall Vista RTM to use the Ultimate version and this
process was simply not happening. It goes through everything until it
attempts to update the boot process, in which case this fails stating that it
was unable to update the boot sector.

Now with my problem outlined I have tried the following things:

Attempting to use installation repair to correct the boot sector, failed.
Resetting the bootsector with bootsect on the DVD to nt52, failed.
Tried the registry fix that had been posted, I didn't have a backup listed,
failed.
Attempted updating the group policies on my boot sector, failed.
Full formatted the partition I installed vista on, no effect.
Attempted to set the /boot directory to fill access and ownership to
adminstrator, failed.
Used the XP disk to reset the master boot record, failed.

I've tried everything I can at this point but I just can't reinstall. Any
help someone could give me would be greatly appreciative. This is getting
really annoying and I can't seem to find a good solution for it.

Thanks in Advance