[Mashiro]

Could you see which program was throwing the error? The error you got is a general .NET Framework error that programs written in .NET Framework can actually throw when running into issues and bugs. So it might have been some program that runs at startup or shortly after that was killed by MalwareBytes and thus was throwing this error message.

Bascially any .NET Framework written application will throw .NET Framework errors but that doesn't mean that .NET Framework is broken. Often the errors are application errors related to the program you are using. I have some kind of FTP downloader client that was written in .NET. It had a bug where when the server was offline it would crash and it would always throw an error like that .NET Framework error. If you look closer at the error message you could see lines about connection issues/timeout. I did a bug report with that error log and the issue was fixed next day.

It's just the way how .NET Framework handles errors and exceptions.