Troubleshoot Windows Installer

Troubleshoot Windows Installer
2438651 How to troubleshoot problems that may occur when you install, uninstall, or upgrade a program on a Windows-based computer
http://support.microsoft.com/kb/2438651

Unregister Windows Installer, and then reregister Windows Installer. To do this, follow these steps:
1. On the "Start" menu, click "Run:.
2. In the "Open" box, type "msiexec /unreg", and then press ENTER.
3. On the "Start" menu, click "Run".
4. In the "Open" box, type "msiexec /regserver", and then press ENTER.

also:

Click Start
Type: CMD, from the results, right click CMD
Click 'Run as Administrator'
At the Command Prompt, type: sfc/scannow

This will check for any integrity violations

Restart your system