|Sorry a little more information may be required to diagnose this issue?|
1. At what point in logging in does this error message come up? Before or after you click your user name/password?
2. And does this happen to any other users on your computer?
3. Does windows let you log in after displaying the error message? and if not then what does it do?
4. What was the last changes you made to your computer before the update?