Looks like there's already an issue with Windows 7 for some people. The download files from Digital River seems to have an issue (or more) with Vista 32bit & Windows 7 64bit Upgrade. An error will pop up that files/folders cannot be written. Not a big issue, but one that will surly annoy thousands of users - particularly those that are not tech savvy. The only work around so far is to make an ISO and upgrade from that. I hope Digital River and/or Microsoft address this issue. This isn't going to go over well Add to this that people in the UK are harping about failed downloads tallying up. Hopefully this is just a little hiccup and not a 'things to come' issue.
Google search on this problem...
Microsoft TechNet (with solution)