I want to correct myself. I imagined that XP 64's extra bandwidth would speed renders up in Vue. I was wrong. Apparently the 32 and 64 bit OS split takes its toll on the render engine. Here are some test times I tested on a simple test scene:

Q6600 - OC'd to 3200 ghz (200 fsb x 8 mulitplier)
   
    XP 32 pro - 4' 6"
    XP 64 pro - 29' and counting - I stopped the render at 53%

Athlon XP +4800
    XP 32 pro - 9' 8"

So, I stand corrected. I believe to see a benefit from the 64 bit OS, the OS needs to be dedicated to the 64 bits only.

Charles