I did not install it into program files. It is actually in a separate folder off of my desktop.
So far I've not been able to prove there are 32 and 64 bit versions, and found at least one site which acts like, but does not say outright, that they are the same. Most, of course, are trying to get the reader to do a free download of a program which will check out your files for free and then fix them, which I note does not say it is free.