Hi. I set up a 32-bit windows a while back and it was always a bit slow. I later found that 32-bit windows only allows 4 GB of memory(I have 12) and uses 1.77 for itself, leaving only 2.23 for games(which is what I use bootcamp for) That's why I want to install 64-bit windows 7 without having to delete my 32-bit one or migrate it all without the hassle of external backups etc. Is that possible or will I have to back up my windows and completely reinstall it?