On this page:
https://support.microsoft.com/en-us/help/10164/i-got-an-error-code-from-windows-update
Microsoft says that error means:
If you receive this error while checking for updates in Windows Update, the Windows Update servers might be experiencing an unusually high number of requests for updates. Close Windows Update, wait 10 to 15 minutes, and then run Windows Update again. You can also wait for Windows Update to run at its next scheduled time.
If that didn't work, try to add the Windows Update websites to your firewall exceptions list, and then run the Windows Update again.
If you are having Windows Update issues I would not start making any adjustments to your system until you have the known fixes for WU - which has been afflicted for many months and the solution is usually very simple.
For hundreds and perhaps thousands of systems the solution is usually very simple.
There are two discussions that should help:
Windows update problems? Read this first.
and/or
Windows 7 Update Solution
If you still have trouble with WU join in on one of those popular and active discussions.