I'm getting everything ready to install Windows 7 on my step-daughters Dell e521 desktop. I've ordered the RAM upgrade(Crucial 2GB kit) but I have one question. How do I do a clean install using the upgrade version of Win 7 Home Premium? The reason for the clean install is because Vista is completely hosed. I'm able to boot into Vista, but with errors. (system registry file missing or corrupt) and because it's a Dell with the recovery partition there were no system disks supplied with this computer. It's also out of warranty, so no help from Dell. Thanks.