Ac1st16.dll errors are caused by situations that lead to the deletion or corruption of the ac1st16 DLL file.
How to Fix "All .DLL files are missing" Error in Windows 10/8/7 (100% Works)
Follow these steps in the order they are listed below to try the simpler solutions first.
Recover ac1st16.dll from the Recycle Bin. The simplest possible cause of a "missing" ac1st16.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 with a free file recovery program.
