AT&T High Speed Internet Important Message from AT&T

Help this occurred on my PC just now after turning it on. It didn't happen 2 hours ago. It only happens on my PC not on my Mom or Dad's devices, this message never popped in our mobile devices.

AT&T High Speed Internet

Important Message from AT&T

Your account needs immediate attention. Residential customers can log in with your myAT&T user ID and password to be back to browsing the internet as quickly as possible. If you are not registered with myAT&T and a Residential customer, please call us at 1-800-288-2020. All Small Business customers must call us at 1-800-321-2000.

To ensure that you reach the right department, it is important that you provide your billing telephone number when prompted.