After deleting every file that even sounded like DDI or Wizards of the Coast on my hard drive, I was finally able to get the full version of Character Builder downloaded and installed. However, I am still a little irritated by the whole affair. If it had not been for the kind people that posted their own workarounds on the WotC forums, I might have just quit in disgust.
The whole process was a real pain and I consider myself pretty darn computer savvy. What do you think the 'average' user would have done? I don't think this bodes well for future electronic releases from WotC, but I'll just have to wait and see...