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Major KEmulator errors include not being able to install KEmulator or having finished installing but unable to open KEmulator to play games. This is not really a system error or a Java emulator on the faulty computer, but because the user has forgotten to make some additional settings and settings for this emulator during the installation process as well as use.
Java emulators are not really popular and used as much as Android emulators today, but it is also the only tool that helps us install and play Java games on computers when there is no supported devices (because most users now own and use smartphones).
With this error, we have two cases, which cannot be installed because the installation is corrupt or the installation has no problem but the computer does not allow installation. How to fix:

Install Java software under Admin
In addition, as mentioned in the previous KEmulator installation guide, users should note that this is a Java emulator, so the computer will require supporting software ( Java Runtime Environment - JRE or Java Development Kit - JDK). For computers that have been successfully installed, but cannot start KEmulator, that means your computer does not have Java or Java has a faulty computer.
In the case of this emulator, we should conduct a Java JRE check to see if the computer is available, if not, you can download and install additional Java JRE for the computer. If it does, it still doesn't work, try updating to the latest version or preferably using professional removal tools, completely remove the old Java and reload the latest version.
Doing:
Step 1 : You access the link above and select Download .
Step 2: Select the JRE download link in one of the links below, then set to save in the next Windows window.
Step 3: Double-click the downloaded file to install.
Double click the installation file to execute
Wait for the installation process to complete, without restarting the computer, you can always open KEmulator again to check again.
If Java has no problem, keep trying to run KEmulator under Admin , the emulator will work as usual.
KEmulator is one of the rare Java emulators that users trust and choose to use the most to install and play Java games on computers. Hopefully this KEmulator fix will help you have the opportunity to better experience with this simulator.
this proplem faced me in win 7 and solved with trying portable version 😋
download portable version of kemulator 0.9.8 from here (worked for me) if it wont work you have an out dated java run time environment or it not installed at all
java run time environment is extremely requested to run kemulator so Un- Install Older Version(s) first then download and install latest from here
now it's working
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