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Click Start, click Run, type MSIEXEC /UNREGISTER, and then click OK. Even if you do this correctly, it may look like nothing occurs.
2. Click Start, click Run, type MSIEXEC /REGSERVER, and then click OK. Even if you do this correctly, it may look like nothing occurs, or you may briefly see an hourglass. After you run this command, the operation is complete.
3. Try your Windows Installer-based application again.
I rebooted after this, and it took me to the windows login screen just fine. After I click on my name to start my session, it takes it probably 15 minutes to load everything. The beginning is just a plain screen, then some icons start showing up, and eventually it loads. Even when it is fully loaded I can't click on anything or it will freeze up.