Windows updating problem
Unfortunately, sometimes one or more of those patches will cause a problem, ranging from serious ones like error messages preventing Windows from starting to less serious ones like video or audio problems.
If you're confident that the problem you're experiencing began only after one or more Windows updates, whether manual, automatic, on Patch Tuesday, or otherwise, continue reading for help on what to do next.
But if you’re looking at a progress bar of the download that appears to be stuck, give it some time, especially if you’re on a Wi-Fi connection.
There have been reports that some updates take over three hours to download, perhaps due to a dodgy server or a temperamental Internet connection.
Current users can upgrade for free to Windows 8.1 via Windows Store.
As Windows 8 has many unpatched critical security flaws by now, those not wanting to upgrade to Windows 8.1 should perform a clean installation of some other version of Windows (7 or 10).
Before beginning any troubleshooting steps, ensure that there’s definitely a problem with Windows Update.
First, check if you have enough free disk space (at least 1 gigabyte) on your hard drive.
If not, read the Remove temporary files article on how to get rid of unnecessary files with CCleaner.
Second, verify that time and date are correct on your PC - a date in the past or the future prevents both Windows Update and Genuine Windows Validation tool from working properly.
But problems can happen: the download getting stuck, the update refusing to install, or the system being caught up in a restart loop.
Error messages for failed updates are rarely helpful, which means it can be hard to find a specific solution.
To get your computer running again, you need to understand how this troubleshooting is organized, as well as make sure that your problem really was most likely caused by a Windows update.