Having a Windows Error Code 8004820 pop up does happen. Fortunately it is a known issue and there are some easy tips to helping you solve the problem. Read our article on Windows Error Code 8004820 and take care of it today.
When you open Windows Live Messenger and try to sign in you receive this error message which prevents you from accessing the service.
Taking care of the Sorry we were unable to sign ... message
TipFor more information, please see: How to fix Messenger error #8004820