Most AES.dll errors are related to missing or corrupt AES.dll files. Improperly shutting down your PC or getting a virus infection could corrupt the AES.dll, which could lead to DLL errors. When your AES.dll file becomes corrupt, it cannot be loaded properly and will present an error message. Other times, AES.dll file errors could be related to issues in the Windows registry. Broken DLL file references can prevent your DLL file from registering properly, giving you a AES.dll error. These broken registry keys can be as a result of a missing DLL file, moved DLL file, or an leftover DLL file reference in your Windows registry from an unsuccessful software installation or uninstallation.