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You don't want to delete your other one, you just want to switch. When you try to install a new language, is that when it tells you Windows supports just one language? Does Step 7 show any other languages already, or only 1?

I've put together some pictures below of how to install and change your Windows Display Language to English (United States). You can easily switch between the two when ever you want by following Step 7 Step 1 Click the windows key at the bottom left of the screen and type in language Select Language settings from the list at the top Step 2 Select the option circled in red - Add a language Step 3 Copy and paste, or type in English (United States) in to the search box Select it from the search list when it appears Select the button at the bottom circled in red - Next Step 4 Leave everything checked as it is shown in the image below Click the button circled in red - Install Step 5 Red text circled in red in the image below will appear. It confirms the language pack is installing A blue install progress bar is also circled in red. Depending on your internet speed, it may take some time Step 6 Select the box circled in red in the image below Step 7 Select English (United States) from the list as circled in red in the image below. Doing this will change your Windows Display Language to English (United States) Repeat this step to change it back to Turkish (or other languages) at any time. It may prompt you to sign out and back in for the language to display properly. This must be done.