Here is the deal. I ended up using the sticker on the side of my new pc to do a clean install of WIN7 about 3 months ago. I had to use the phone automated activation at the time which activated fine. This was before I knew how to backup the key and cert. The pc came with Windows 7 Home Premium 64 bit. It is a Compaq. But came with all the HP bloatware. Runs so much better with a clean install. Any ways. I would like to get Ultimate on here with out doing a reinstall. Can I use Daz loader to install key and cert.? Then after that. Use the Ultimate OEM upgrade key. Or would it cause a big activation issue since I am already activated using another key?