Core.dll errors are caused by situations that lead to the removal or corruption of the core DLL file. In some cases, core.dll errors can indicate a registry problem, a virus or malware issue, or even a hardware failure.

Follow these steps in the order they are listed below to address the most likely solutions first.

Recover core.dll from Recycle Bin The simplest possible cause of a "missing" core.dll file is that you accidentally deleted it.

If you suspect this, but you've already emptied the Recycle Bin, you may be able to recover the file using a free file recovery program. Just make sure the file was working properly before it was deleted (that is, it wasn't corrupted or malicious).