Hi,
**1)**Which updates were installed prior to this issue?
I would suggest you to try the steps provided below and check if it helps.
Method 1:
Troubleshoot problems installing and uninstalling programs on Windows-based computers.
http://support.microsoft.com/kb/2438651
Method 2:
If the issue persists then set your computer in Clean Boot state and then try to install it.
By setting your system in clean boot state helps in identifying if any third party applications or startup items are causing the issue.
How to troubleshoot a problem by performing a clean boot in Windows Vista or in Windows 7:
http://support.microsoft.com/kb/929135
Note: After clean boot troubleshooting step, follow Step 7 in the provided link to return your computer to Normal startup mode.
Follow these steps to reset the computer to start as usual:
a) Click StartCollapse this imageExpand this i, type msconfig.exe in the Start Search box, and then press ENTER.
If you are prompted for an administrator password or for confirmation, type your password, or click Continue.
b) On the General tab, click the Normal Startup option, and then click OK.
c) When you are prompted to restart the computer, click Restart.
Hope this information is helpful.