I would do the following things:
I would download the Microsoft Installer Cleanup Utility (Microsoft stopped supporting it for their products as they developed newer ways to uninstall Office completely, but it still works, and can help in situations like this one).
Download it to a location, then right-click it and "Run as Administrator" to install it. With Windows 7, it does not know how to create a Startup group, so go to the
c:\Program Files\Microsoft Installer Cleanup directory. Run Msicuu.exe, and see if TuneUp is listed. If so, highlight it, and click "Remove".
Also download and install CCleaner. Run the Registry cleaner and "Scan for Issues" and then "Fix selected issues". Run it again until there are no issues.
Then try your install again.