Lol, one of those upgrade variables is a left over C:\WINDOWS directory from your older version of windows after the upgrade. Idk if that's the case anymore.
Then again upgrading any os is a pain. Best to just do a backup of your files and do a fresh install. Now if all you did was purchase an upgrade disc, then microsoft will let you do a fresh install with the upgrade disc, just as long as you have a past version of windows disc (that windows 7 will let you upgrade from) that the upgrade installer can verify with first before the fresh install happens.
As easy as booting up with the upgrade disc, and then eventually the upgrade disc will ask you to pop in your windows cd you're upgrading from, spits it out, put back in the upgrade disc, and away goes your fresh install.