The a4s2.dll error message is an indication that the SFG MFC application on your computer has encountered an error. As this message contains a DLL file (a Windows Dynamic Link Library file), you can be fairly certain that you are dealing with registry errors, but it is also important to rule out the possibility of a virus infecting your system.
If you are inclined to fix computer errors yourself, you should be aware that the steps required to resolve this type of issue are not even attempted manually by computer repair professionals. They rely on scans to isolate many errors at once, keep their computers running smoothly, and assess the security threat that may be associated with error messages.
We offer this type of scan, and you can get started by clicking below. Once the free scan is complete, use ZookaWare PC Cleaner to fix these errors and then set it to perform regular maintenance on your system to keep your computer running like new.