The Mother Board

Is anybody folding with vista 64? And if they are, is their any big difference in PPD between vista32 and vista64?

Also can you have vista 32 and vista 64 as dual boot options?

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Amd Phenom 9500 Quad on a ECS a770m mobo
4 gigs ram
ATI Radeon x1950pro w/1 gig ram video card
2 250 gig samsung sata HDs
2 lite on sata dvd burners
all in a raidmax blue neon case running Vista64
total cost under $600 built march 2008

Would not advise having a 32-bit OS and 64-bit Vista OS install as dual-boot. Files are different for both versions, and ancillary programming also is different.
Best would be the compatible 32-/64-bit version.
The 64-bit version would overwrite those programming files which the 32-bit OS uses.. and render the install useless.
Stanford obviously is formulating the F@H process for optimal use with Vista 64-bit OS versions. Should be a Beta version available soon that will take advantage of the 64-bit properties. There already is a Linux 64-bit version.
All the OS versions for F@H can be found here.. http://folding.stanford.edu/English/Download
You can easily set up the F@H program as multiple threads with dual-core or quad-core CPUs.. and not have any problems, as long as each process is in a unique folder of its own.. with a control line specifically to that folder.
Some users can assign a priority core for each F@H process.. but if the routines are quite different in execution, it may cause one core to run hotter than the other.. leading to stability problems. Best to let the OS distribute the threading 'as required' so all cores are equally active.

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F@H.. to solve mankind's maladies.. in our lifetimes!

I don't think a dual of Vista is a good idea. If you want a dual boot go with Vista 64 and XP 32, I know this will work.