The Windows 104 error is a common problem for many different PCs, and is basically caused by the way in which your system will attempt to process a set of "variables" on your system. The specific cause of the problem is that your computer will be able to process various "semaphore" variables that your software applications will use to run. These variables are what your computer uses to help load up a variety of secure data for your system, and are used to store the likes of login details & passwords. Although these variables are highly important, they are continuously causing problems for your PC, and are the main cause of the 104 error.
What Are Windows 104 Errors?
This error is specifically caused by your PC having "semaphore" variables already in use - blocking your current application from being able to create the variables it requires to run. If you're not technically minded, all you need to know is that this is a temporary error caused by the application you're trying to use - meaning that if you want to resolve the problems you're seeing, you need to first wait for any variables that are currently in use to disappear; and then fix any possible software errors which your PC may have inside.
How To Fix Windows 104 Errors
The first step to fixing these errors is extremely simple - you just have to wait for a few minutes and your system should correct the issue itself. After that, if you still encounter the error, you should look to repair any of the issues which Windows is causing - which can be done by first re-installing any program which is causing the problem. It could be the case that your system will have some sort of issue preventing it from correctly reading the settings that your computer requires to run - leading your computer to run with a lot of errors as a result.
The second step to fix the 104 error is to then repair any of the errors & problems that could be inside the registry database of your PC. The "registry database" is a central storage center for all the files, settings and options which your Windows system requires to run, and is where everything from your desktop wallpaper to your desktop wallpaper is kept. The Windows 104 error can often be caused by your computer being unable to correctly read some settings from the registry, preventing your PC from being able to load up the "variables" it requires to run. To fix this problem, you should look to repair the errors on your PC by using a registry cleaner program.