Hi Kaden,
We are currently aware of a bug that prevents our customers from logging into a Microsoft account after the latest September update. Just to confirm, is your computer under Windows 8.1? To check, press the Windows key and R at the same time, type winver, and press OK. If your computer is on Windows 8.1 and not Windows 8, then you're experiencing this due to the bug. Our Support Engineers are already looking into it and doing their best to resolve it as quickly as possible so as to minimize the inconvenience to our customers. We'll keep you updated via this thread once a bug fix has been released.
Regards.