Well for one thing, you can only do a straight clean install if you purchase a WX license key. If you want to take advantage of the free upgrade you have to do the upgrade first then you can do a clean install. The recovery partition should not matter if it gets deleted when trying to boot into Windows 7. I believe that error pertains to something being corrupt. Your best course of action would probably be to re-install Windows 7, then proceed with the upgrade, or if you want to go straight for a clean install, buy a WX license and install that.