I currently am using Windows XP but want to upgrade to Windows 7 Professional using a clean instal. But I am confused at the different versions of update softward advertised on the internet. I see Windows 7 Pro OEM listed at 149.99 (download) or 159.99 (DVD). Then I also see Windows 7 Upgrade (Old Version) at 299.99, and Windows 7 Upgrade (FQC-00130) at 118.00 to 261.99. Also FQC-04617 listed as Windows 7 "Operating System Software" at 134.99, and the same FQC-04617 listed simply as Windows 7 Upgrade at 74.99 to 98.99, marked down from 149.99. Obviously there is some difference in marketing and pricing here, but there is also a difference in the product being advertised. What version should I be buying, and what is the difference between an OEM disk and non-OEM?
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