In past, we have posted a batch script to reset Windows Update components and services to fix such kind of issues.You can download and run the Windows Update reset script from following article: Windows 7 provides a built-in troubleshooter to fix issues related to Windows Update.
You can also use Services Manager program to stop Windows Update service.
Check out METHOD 7 in following tutorial to learn more about it: of Windows 7.
You need to download and install following updates manually: These updates will upgrade the Windows Update client and will make some improvements to the client program.
These updates are available for both 32-bit (x86) and 64-bit (x64) editions of Windows 7 operating system.
Windows Update just gets stuck at "Checking for updates" screen and Windows 7 doesn't download and install any update.