Adobe Illustrator — Cs5.1 Amtlib.dll

Run the Adobe Creative Suite Cleaner Tool to remove any leftover corrupted files.

amtlib.dll is a Dynamic Link Library (DLL) file developed by Adobe Systems. The file is short for "Adobe Activation Manager Library" and is responsible for managing the licensing and activation of Adobe products, including Adobe Illustrator CS5.1. Adobe Illustrator Cs5.1 Amtlib.dll