When I try, I receive the following error message:
A computer restart is required. You must restart this computer before installing SQL Server.
Of course, I have restarted the computer :-) I'm not really sure how to proceed.
The version that sql server reports when I query it is: SQL Server 10.0.1600.22 - RTM (Express Edition with Advanced )
Solved: As it turns out, I had to end up uninstalling logitech's quick cam pro software. Although the fix below did not directly resolve it, the value of that registry key led me to discovering the solution by querying for it online :-) thanks!!!