I did a clean install of 7 without anything on the drive first, I got a new drive after I had a keylogger (I thought I'm going to be wiping it with killdisk, why not get a bigger one for £35 instead of doing it later anyway). I thought I'd give it a go before installing Vista and it worked fine, you just have to chose the clean install option and not the upgrade.
This was a 'proper' Microsoft Upgrade version and not a Dell one if that makes any difference.
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