I'm installing Win 7 on a computer (an iMac in Parallels, to be specific). But I'm two releases behind and no longer savvy about Windows. Will the following work: I have Win XP Home OEM installed on Computer A. I want to uninstall XP from Computer A, and then use XP OEM disc to validate and install Win 7 Home Premium Upgrade on Computer B; preferably without first installing XP. Can I do this? Perhaps more simply, does Win 7 Home upgrade need to see an XP installation, or does it just need to see install media to operate? And does an OEM copy qualify? (MS website seems to say it does.) Thanks!