Why would you lose your rakeback? You could play on a different computer half way around the world and would still get your rakeback like normal. Uninstalling and reinstalling should work as I know plenty of people use windows 7. I am guessing you went the Upgrade route and not a full clean install? A full format and clean install is always the best way to upgrade an Operating System. As for HEM and postgreSQL it shouldn't effect it but whenever doing an "Upgrade" from 1 windows OS to another anything can happen. Just back up your archived hands, anything happens can always just rebuild your database.
* Updating instead of a clean install can leave lots of things messed up, it is probably the reason FTP didn't work, but other things may not work either. I really want to stress that you should ALWAYS do a clean install, the upgrade option leaves tons of crap/junk and may give you headaches later.