I had some problem but they were due to some indicators that use DLL, you have two options ?

delete all the the indicators (copy them in another folder ) then when your MT4 opens remove the indicators from the charts , close the MT4 then palce back the indicators on thier folder and add them again till you know which indicator is causing the problem !!

or install new MT4 on a new folder copy your old files from the old MT4 excpet the profile, ( that will keep all your setting) except the charts you have setup I hope that will help

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