To the original poster, open Windows Update from the Control Panel, check for updates and see if there is an errors related to previously installed updates.
I'd recommend you simply install Windows 7 SP1 as it includes a complete roll-up of all Windows Updates up until the release of SP1.
Also please take note of where you're posting your thread next time. Always take a moment to scroll down the homepage to see where the best category is and post there. I have moved this thread to Windows 7 Support.