There is no problem with the 64 bit OS as you can always run it on compatibility mode. The thing about a 64 bit is that it can also run a 32 bit software but a 32 bit software cannot run a 64 bit one.
I think that it is just some sort of an add-on with being able to manage resources better that is why there is a 64 bit release.
I am not that sure though if your graphics card could handle it. If you cannot get it to function properly or it would appear a bit muddy, try upgrading to the latest drivers or even try allocating more memory if you have the boost technology.
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