This warning is caused by the Turkish character problem. You must edit your computer language and region settings in Turkish.
Enter the control panel.
Click on the clock, language and region icon.
Click on the title of the region .
The region dialog will open. If you set the "Language of non-Unicode programs" option to Turkish in the Administrative tab, the characters will appear correctly.
To do this, click on the change system locale button.
The region settings dialog will open. List of Turkish (Turkey) you select.
After doing the procedure, turn the computer off and on.
If this warning appears even though your settings are in Turkish, you must first select a different language and country and restart your computer. Then again, Turkish (Turkey) will fix the problem if you select restart.