Runtime Error 11 is a computer error that commonly appears on screen via a message box that indicates what kind of error is happening in the system. When this error occurs, you can expect the system to have problems shutting down, show blue screen errors, or even suffer data loss. Of course, the effects will vary according to the range of complications in the system. Basically, this error is informing you that Windows cannot access certain required files and settings. Miscommunications like this in the system can cause all kinds of errors, including Runtime Error 11.