Affiliate Marketing Secrets

I am about to buy Windows 8 Pro this weekend probably, and was wandering in-case I don’t like Windows 8 or have issues with it, if it is possible to revert back to windows 7. I do have a External Hard drive that is 2 Terabytes and has My System Image and Backup for all my computers, which i will probably redo before I upgrade to windows 8. Also wandering is there any TECHNICAL problems with windows 8? (Besides the way it looks and the confusing UI, I’m pretty good with computers so It won’t be confusing to me.)