Installing PS CS5.1 32bit and 64bit

I accepted the defaults while installing photoshop and it seems 2 versions installed?  Do I need both the 32bit and 64bit versions on Windows 7 64bit ?  Also, when I look at installed programs it only indicates Photoshop CS5 without any 32bit or 64bit designation.  What is necessary here.  Are there bugs with the 64bit version like MS Office so the 32 bit version installs also? 
thanks
Milton

Both 32 and 64 bit variants are provided in case you have plug-ins or drivers that only work with one.  For example, older plug-ins are generally 32 bit only, and there are no 64 bit TWAIN drivers.
64 bit Photoshop will allow you access to your entire memory space, in excess of 2 GB, while 32 bit Photoshop will be limited.
Advice:  Keep 'em both, use 64 bit primarily, and use the 32 bit version if/when you have to.
-Noel

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