It seems every time I click "Multi Player" a message comes up saying "tb.exe has stopped working". So what should I do?

hmm... try to ask for help in the support service which is located in the HELP tab in the upper panel, but maybe your pc cant handle the game settings?? try put them into minimum before going into multiplayer by going to setting, graphics etc

Post this in support service, from my expirience it was because the toribash doesn't installed properly try to reinstall

Either try restarting your computer or you can reinstall Toribash. Make sure to back up your replays though as they will be deleted if you reinstall.