The file m3msg.dll belongs to My Web Search Community Tools from MyWebSearch.com. The My Web Search Community Tools are part of a toolbar that shows up in your internet browsers when it is installed.
The toolbar is widely considered spyware, and if you find this file on your computer you should immediately run SpyZooka to check for malicious programs. The toolbar tracks your browsing habits to send you targeted ads. It also is difficult to remove and hides itself without uninstalling when you attempt to remove it, which is one reason it is considered spyware.
Some users do not mind having their habits tracked. If you are one of those users and would prefer to keep the toolbar on your system, you might try running ZookaWare PC Cleaner to fix the dll error. ZookaWare PC Cleaner will scan your computer and fix any registry entries, allowing your system to run cleanly. You should regularly scan your computer with SpyZooka and ZookaWare PC Cleaner to check for spyware and registry errors.