PC technicians and support personnel may refer to MSN Error 691 as a "runtime error." Debugging is performed at many phases by programmers to ensure that MSN is as error-free as possible. Unfortunately, issues such as error 691 may not be rectified at this time. In the most recent version of MSN, an error message indicating "MSN Error 691" may be shown. If error 691 is encountered, customers can notify Microsoft Corporation by email or bug reporting. Microsoft Corporation will then be able to investigate how and where the problem might be resolved. As a consequence, if you see an MSN update notification, it's typically because it's a remedy for error 691 or another issue.