Just reading all the above, and what I believe is that if you uninstall the (x86) file your product ID licence is hijacked meaning your warranty is lost, Microsoft themselves advised me not to try and get rid of this folder as I thought it was quite strange myself with a 64 bit win 7 OS with (x86) program files too.
They did say it would leave my computer very instability and @ high risk of crashing.
Pretty much your best thing to do is to leave the file, when installing new software on your PC make sure it’s just going into your correct program folder, Like really when you think about it what’s it really hurting? You get the best of both worlds with the 32 bit programs and you 64 bit which some applications need that folder to function.
Take adobe master collection for example it runs mostly with the (x86) program folder and a small amount ends up in your new OS. Honestly just leave the program; you’re not going to get back heaps of disk space anyways