A common problem with MT4 is it will enter a loop of closing itself once opened and connected. You don't need to re-install your MT4 or delete your data folder, all you need to do is remove one file called "Community.ini" in the Config folder.
Open your MT4. Just before it closes itself you'll have just enough time to quickly click on FILE and click on OPEN DATA FOLDER.
Once you're in your data folder, open your CONFIG folder.
Inside your CONFIG folder, delete the COMMUNITY.INI file.
Restart your MT4 client and it will no longer close itself once loaded!
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