Hi, I paid Ã‚Â£30 for the Windows 7 Professional Upgrade as I'm a student. Yesterday I bought a new 500GB HDD and some more RAM to use for Windows 7. I downloaded the files from the link provided in the e-mail I got, and extracted. I was then given a strange error message, which upon Googling turned out to be because I was running XP 32bit whilst trying to install a 64bit O/S. One of the workarounds was to burn the setup to a disc using OSCDIMG and Nero, and install from boot. All worked well, and I didn't enter my product key during the installation because it was in an e-mail and I forgot to write it down. Now it's all setup and working fine, and when I try and activate Windows 7 I get the error message "The software licensing service determined that this specified product key can only be used for upgrading, not for clean installations". !!!!!! I would like to point out that if the setup had worked in the first place from within Windows XP, then I wouldn't be having this problem! Anyone got any suggestions, other than re-install (I stupidly setup e-mails, photoshop and other software before activiation!)? Thanks, Thomas.