This is a reoccurring and annoying dialog box message, and there ain't a damn thing you can do about it... OR IS THERE???? 99% of the time 'amtlib.dll' is flagged as a threat by your AV program, usually falsely, but still it either gets deleted or quarantined after the initial startup of the program 'Acrobat' or whatever, or immediately after reparing or reinstalling the product. YOU MUST STOP YOUR AV PROGRAM FROM ACCESSING THE FILE Here's my solution.... Check your anti-virus program (SEP, McAffee, AVG, Microsoft) has not deleted or quarantined AMTLIB.DLL It's an essential component of Acrobat and Adobe products, and I discovered that it had been deleted I turned off my AV, reinstalled/repaired the Acrobat installation, and added an exception to my AV to ignore the file C:\Program Files (x86)\Adobe\Acrobat DC\Acrobat\amtlib.dll Guess what, it worked. AND IT'S ABOUT TIME TOO !!! ... View more