Hi there, I purchased Windows 7 home upgrade version on advice from a sales rep. I had been using windows Vista Home premium so I was advised the Home upgrade copy of W7 would be all I needed. Upon purchasing and installing the upgrade, I later realized I could no longer perform backups to a network location (a feature I once had with Vista). As I cannot return this product anymore, and I also do not wish to spend money on finding a program that allows me to backup to my Network location, there were other components to this 'upgrade' I did not like nor feel had been worth the purchase. Greatly disappointed in losing a very essential component, I had to downgrade to Vista. I would like to try and sell my purchased copy of Windows 7 but am trying to figure out if I first need to unregister it and, if so, how I can do that? Thanks.