msvcm80.dll is related to some functions and resources that allow your applications or PC games to run properly. If msvcm80.dll is missing or corrupt due to various reasons, you may encounter errors. When a .dll error occurs, you are usually notified via a pop-up error message that will inform you what kind of .dll error you have.
Other possible msvcm80.dll errors:
To fix the msvcm80.dll or other .dll files related errors automatically, download the DllKit, the .dll repair tool, and perform a scan for invalid or missing .dll files. DllKit will also check whether other .dll files are registered in your system and search for other issues that may be preventing your system from working properly. After the scan process is complete, DllKit will help you to get the errors fixed.
More information about msvcm80.dll on WikiDll.com