Experts are standing by to help you solve this problem. They know what that error message means. But before they can help you, there are some details they need.
Are you the only one that uses this computer?
What kind is it?
Make? Model? How old is it?
When did it start doing this?
Is it running Windows 7 ?
If you turn off the power, wait ten minutes and then turn it back on, - Then what happens? Same message?