Hey dear its a virus, If your PC met the fix M3plugin.dll error, luckily your antivirus has already removed it from your pc. one trace is remains in registry which will try to load it on startup.
Ok, do the following step and get rid of it.
Open Run , type regedit and press enter
Go to dllerrorsfix.com/three-ways-m3plugin-dll-error-can-be-fixed.html