I got an old laptop that used to belong to my dad, it was originally a vista machine, then he upgraded it to win 7. I was doing some basic maintenance, and noticed that the laptop had 4gigs of ram installed, but could only use two, since it was 32 bit. Which then lead me to believe that it was originally a 64bit comp, but then my dad used the wrong upgraded disc when upgrading to 7. So what I'm asking is; is there a way to directly upgrade it to 64bit? If not, I think there are still some backups from it's vista period, so I could restore to that point and then re-upgrade to win7, in 64bit. If that's possible.