If you are trying to fix problems related to downloading / installing Windows 7 updates, then here is an way to fix them. If Windows 7 is not able to install or download its updates, then there might be some kind of inconsistency in it.
Microsoft itself has come out with its System Update Readiness Tool for Windows 7 which would actually find any kind of inconsistencies found in the operating system. It takes our the errors which does not allow your OS to download and install Windows 7 updates.
This tool scans your computer and successfully fixes all the inconsistencies that it finds. And this will also download and install all those updates, which were not being allowed on to your operating system.