I can't log in, help!

Problem description: Whenever I try to log in it doesn’t let me, then pops up an error message.

Error code/error message: We cannot sign you in to MSN Messenger because we have made changes to the .NET Messenger service that affect yor account.

What has been tried so far: Everything i could think of

Messenger version: MSN Messenger 7.5

Windows version: Windows 10 Pro