The “Only one instance of wusa.exe is allowed to run” error can be fixed in a variety of different ways and it occurs in various different scenarios such as updating Internet Explorer, installing a standalone update manually, etc. That is why it’s important to keep track of all methods and try them out as soon as possible.
Solution 1: Disable Your Third-Party Antivirus
Third-party security tools can pretty much spoil all the fun and cause all types of errors on users’ computers. These errors are not so common but, when they appear, the real cause is very difficult to locate yet easy to solve. You will need to disable or uninstall the third-party antivirus tools before initiating the process which throws the error. The error occurs mostly with McAfee users to the instructions are for them. Steps are quite similar from antivirus to another.
Solution 2: Check Task Manager for Another Instance of “wusa.exe”
As the name of the error code is quite self-explanatory, a possible fix would be to check whether there is a second instance of wusa.exe running and preventing your from proceeding with the desired update. This method is not always successful but it’s very easy to check it out.
Solution 3: Check the Status of the Windows Installer Service
If there is something wrong with the Windows Installer Service, it’s natural to expect that any problems with it are going to affect any possible installation or update. Luckily, it’s quite easy to restart or repair a service and this is what makes this method highly successful among users.
You may receive the following error message when you click on Start: “Windows could not start the Windows Installed Service on Local Computer. Error 1079: The account specified for this service differs from the account specified for other services running in the same process.” If this occurs, follow the instructions below to fix it.
Note: Another useful thing you can perform with the Windows Installer Service is to reregister it and check to see if that solved the problem. This will also take a minute and it can actually solve the problem. %windir%\system32\msiexec /unregserver
%windir%\system32\msiexec /regserver
Solution 4: Install the Update Manually
Unfortunately, it seems that sometimes the only way to actually solve this problem is to take matters into your own hands and install the update manually if the automatic process is simply not working for you. Good luck! The process of installing is somewhat more complicated but it’s nothing too difficult and you will end up with a fully updated PC.
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