How about this:
I am aware of responses to a previous thread on this topic (also posted by me) such as EULA quotes to the effect of "one user per installation" One verision per user, etc. But this is an ACADEMIC question : is a dual boot windows 32 bit and 64 bit setup POSSIBLE? (OMITTING EULA RESTRICTIONS for the sake of argument)
Assuming you have a copy of Windows 7 (with a EULA that allows installation on more than one PC see the last paragraph of this post), COULD you, for the sake of testing compatibility/suitablity issues, install Windows 7 32-bit AND Windows 64-bit as a DUAL BOOT system (ensuring each OS is installed on a different hard disk or on different partitions of the same disk)? And, if so, would they interfere with each other in any way (I would expect not, but maybe......)
Would the one detect the other and refuse installation? (Main Boot Record, MBR, conflict?)
If this IS possible, it's one way to test if the 64-bit version is "for you" or not, without messing up your 32 bit installation.
Presumably one could also do this via installation on a virtual drive?
Of course, in my "Just for the sake of argument case", any software tested with both OS-es would also be required to be used in accordance with each one's applicable EULA.
(Incidentally, I believe, legally, it WOULD be OK to install a 64 -bit and a 32 -bit version on the same PC if you had a EULA that permitted installation of "windows 7" ("the product") on any 2 PCs in your household. A number of Loungers have posted that they have such versions of Windows 7). Only one "version" would be able to be used at a time by the "Same user".)