Failing Dell Dell XPS 720 64 Bit RAID Drivers

I have been trying, for the last 2 days, to install Win 7 (64 bit) to my Dell XPS 720. I performed the pre-install check and it reported no problems. As I was going from Vista 32 bit to Windows 7 64 bit I knew I would have to perform a clean install.

I have installed about 6 times over the last couple of days and the system seems fine for maybe 20 minutes at which point one of two things happens. either

1. it reboots after a brief blue screen message regarding BAD_POOL_HEADER (too quick to read)

2. it hangs and performs a dump with a BSOD regarding NVSTOR.SYS

I'm assuming that the problem is with the NVSTOR.SYS driver(s) for the motherboard NVIDIA RAID arrays. I have 4 disks in 2 RAID 0 arrays of a 1TB each.

Dell does not list the PC as Win 7 compatible and there are no Windows 7 64 bit RAID drivers listed although it does list Vista 64 bit drivers as a download. I have tried these but Windows 7 doesn't seem to want to update the driver saying I already have the latest drivers installed (from the Windows 7 DVD).

Anyone else had this problem and been able to cure it. I'm writing this from the PC with the 32 bit version installed and working fine. I need 64 bit to address the 8gb of memory for some very intensive video and photoshop work I do.