It's not just the 32 bit version that has problems with more than 3 GB
of memory. This patch applies to both the 32 and 64 bit version. I
installed it after contacting Corsair support when my new Vista 64
system would would BSOD with 4GB of memory. They directed me to the
patch and it worked great.
http://support.microsoft.com/kb/929777
Fitz