: If the file suddenly disappeared, check if your security software quarantined it. You may need to restore it and add an exception. Important Cautions amtlib.dll is missing from your computer - Adobe Community
Windows will automatically scan for and attempt to repair any missing or corrupted system files. A Note on Security You may see "fixes" online suggesting you replace amtlib.dll Adobe Illustrator Cs5.1 Amtlib.dll
: Cracked software cannot receive critical security patches or feature updates from Adobe, leaving your computer vulnerable to exploits. : If the file suddenly disappeared, check if
Compatibility Mode: Right-click the Illustrator shortcut, go to Properties, and set Compatibility Mode to Windows 7. : If the file suddenly disappeared