Hi,
I would suggest you to follow the steps from this KB article and check if it helps:
http://support.microsoft.com/kb/2438651/en-us#reso1
Also try performing clean boot and then try to install the updates and check if it helps:
http://support.microsoft.com/kb/929135
NOTE: After you have finished troubleshooting, make sure you put back the computer to normal startup mode as suggested in step7 from the above KB article.
Check if this helps.