hey guys I just wanted to share w/anyone that had the same problem as me. which is the windows defender & mcafee antivirus deleting the MS client .exe file. you can resolve the issue by opening your mcafee application. simply go to settings and find (quarantine) it should show that the .exe file has been placed there. because of the antivirus firmware detects that it is a threat. after you recover the file go to settings again and click under (real time scanning) there should be an (exclude) option. click on it and add the maplestory .exe file in.