I just got my new computer which uses Win 8. I was using XP with my previous computer. I notice the game installed to Programs Files(x86). However, with XP, I believe it went to my Program Files. I was just wondering if there is a difference between the two. Should I move it to Programs? Or just leave it in Program Files (x86)? Thanks.

No difference. However, they are both protected if they are on the system's root partition. You should probably move/reinstall outside of there.