Thanks for the help... I ended up on the phone with microsoft, who after making me jump through some hoops sent me to tech support. We tried all sorts of various tricks (including the one you mentioned above), all to no avail. During this process I discovered that while 99% of my programs made the transition seamlessly, Internet Explorer did not.
I booted into safe mode, deleted the ie7 and ie8 folders from C:\windows (internet explorer was not showing up in my add/remove programs list) and reinstalled ie8
Once IE was working fine the activation screen popped right up!!!
Thanks again, and I hope this information helps others out there who are struggling with the same problem!
Marc