I need to slipstream Service pack 2 and Raid drivers into the X64 CD. How do I get the X64 updated from a 32 BIT environment??

From what I understand, you can use the regular method of slipstreaming. You don't HAVE to be in a x64 environment to slipstream a x64 service pack into an x64 source/disk. The MSFN unattended guide gives excellent directions to slipstream service packs.

nLite can also handle the slipstreaming, and it's a 32-bit application.

I assume it can integrate RAID drivers also

I went through that hassle recently so what I did was download the full standalone SP2. I first installed XP 64 bit on my intended machine...from the original disk. I installed nLite on there and integrated my nvidia x64 raid drivers and the SP2 into the OS image. Then I started stripping stuff out from the OS. With SP2 integrated my CD image came to around 234 MB. It could have been a lot smaller I am sure but I kept stuff that I wanted to use. Then I reinstalled XP 64 bit on that machine again after doing a format and voila it all worked smoothly.