If you have recently done a fresh installation of Windows 7 and the update utility will not run any updates, you must install a few hotfixes first.

KB3168965: https://support.microsoft.com/en-us/kb/3168965

KB3145739: https://support.microsoft.com/en-us/kb/3145739

KB3078601: https://support.microsoft.com/en-us/kb/3078601

KB3164033: https://support.microsoft.com/en-us/kb/3164033

KB3109094: https://support.microsoft.com/en-us/kb/3109094

If the updates still aren't working you can use this one as well:

KB3138615: https://support.microsoft.com/en-us/kb/3138615

or you can just download the entire update package here, but you might need to install the hotfixes first.

Service Pack: https://support.microsoft.com/en-us/kb/3172605