Windows Update error 800f0826 is displayed when an update for Windows has failed to install and is preventing you from installing additional updates. Error 800f0826 does not identify the update that has caused the problem. The update that has caused the problem will display a different error. This problem affects updates for Windows only and does not prevent you from installing or automatically receiving updates for other Microsoft programs, such as the Microsoft Office System.
To prevent error 800f0826, you need to identify the update that's causing the problem (it will display a different error message), fix the problem, and then try installing updates again. Here's how:
Open Windows Update by clicking the Start button . In the search box, type Update, and then, in the list of results, click Windows Update.
In the left pane, click View update history.
Find updates for Windows that have failed to install. Updates that have failed will display Failed in the Status status column. Make note of the name of the failed update, and then double-click the update to view more information.
In the Windows Update dialog box, next to Error details, review the error code for the failed update. If the description includes error 800f0826, click Close, and then repeat steps 3 and 4 until you identify an update for Windows that does not include error code 800f0826.
Follow the links in the Windows Update dialog box under More Information or Help and Support to try to fix the problem, and then try installing updates again by using Windows Update in Control Panel.
If the preceding step didn't work, try the following steps.
In the right pane, click one of the following links:
Important updates are available
Optional updates are available
In the Select the updates you want to install dialog box, find the failed update that you noted in step 3, and then clear the check box.
Click OK, and then click Install Updates.
If you could not find an update for Windows that failed because of an error other than 800f0826, or if the problem persists after you have followed the steps above, an error in another area of the operating system might be preventing you from installing updates. If you continue to see this error, see this automatic troubleshooter
on the Microsoft Support website for additional solutions, or go to the Microsoft Answers
website for more assistance.
Error codes this applies to: