Re: Cannot create backup disks Inspiron 620
For an alternative method see my two wikis "A Clean Install of Windows 7" and "Microsoft Downloads". This will allow you to perform a clean install; phone activation will be required however.
I have requested Dell to make Windows .isos available for download; this Idea is "Under Review" in Dell IdeaStorm so maybe they will be available soon also.
Tech Enthusiast and Author of the Unofficial Dell Windows Reinstallation Guide