I also received this error. It turned out to be two things... Outlook 2003
was conflicting, and then it was an installation error. I uninstalled Outlook
2007 Beta, then uninstalled 2003. Re-booted. Then re-installed 2007 Beta, ran
Office Diagnogstics and the problem was fixed. I am back up and running
perfectly. All my setting were saved, accounts and all. I did make a backup
just in case. Good luck all.