A bit brutal but it works...
Run the following in a command prompt.
MsiExec.exe /X{6C8D5E56-CA12-42B2-9075-044B4C7067A9} /quiet
Check that the string is the same for your version first:
1. Open up registry editor
2. Browse to HKLM\Software\Microsoft\Windows\CurrentVersion\Uninstall
3. Highlight the 'Uninstall' key and hit F3 and in the search field type
Deployment4. Look for the Uninstall string and confirm its the same as above. If not change as needed.
NB: you must leave the /X instead of /I