PS CS5 64-bit or not?

Hi,
I'm about to install Photoshop CS5 on Windows 7 64-bit. The installer by default seems to want to install both 32-bit and 64-bit versions of Photoshop. Is there any reason to install both, or should I install only the 64-bit version (or maybe the 32-bit version)
Thanks,
Ariel

I never installed the 32-bit version since I'm on a 64-bit OS, so I can't tell you if there is a performance difference.  Most sites I see say that most performance gains by going 64-bit are in the range of 5-12% at most.  It's nothing amazing.
On my machine, the load time for Photoshop CS5 Extended x64 is AMAZINGLY fast.
Of course, I have an open ticket with Adobe right now (one in which they are supposed to be calling me to troubleshoot the issue) because this is the only program which RELIABLY seems to cause the display driver to fail and recover successfully over and over.

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