Any know of or have a 'hack' that will permit a forced 'Upgrade' option on the Windows Vista Ultimate RETAIL upgrade DVD. I have a client with a new Dell XPS M1330. It came with Home Premium by mistake. Dell suggests returning the laptop to rectify because the 'Clean (Install) Option' indicates a new installation and new directory. Microsoft will support the RETAIL purchase, but it will likely be a Clean Install method, which doesn't help the situation. Is there a Registry Key to create/modify OR another 'setup' file to edit that might allow an Upgrade to load over Dell's OEM Vista Home Prem. image? Anyone?