Adobe Illustrator Cs5.1 — Amtlib.dll ((link))

Just when she was about to throw in the towel, Emma stumbled upon a forum post from a fellow designer who had encountered the same issue. The solution was buried in a lengthy thread, but essentially, it involved deleting a specific registry key and then reinstalling Illustrator.

Troubleshooting the "amtlib.dll" Error in Adobe Illustrator CS5.1 Adobe Illustrator Cs5.1 Amtlib.dll

Registry Corruption: Windows registry entries pointing to the DLL become invalid. Troubleshooting and Installation Steps Just when she was about to throw in