Cant start

when I try to launch horizon it shows the little horizon thing then almost immediately says cant connect to the server and I click ok it tries again and then it says horizon has stopped working.
I was using it 2 hours before this started happening so I uninstalled it and reinstalled it but it still did this.

Something to try is right clicking Horizon and running it as an admin. You could also add Horizon to the exception list for any Antivirus you may have.