I have a friend who bought a computer from NYC Chinatown 4 years ago. Now every time she turns the computer on, there is a message: "your windows operating system did not pass the authentication test".
1. Does it mean her computer has a pirated copy of Windows OS?
2. What she do to fix it?
3. Is there a "good" copy that she can download to fix it?
4. There seem to be lots of unwanted programs with lots of virus in them. How can she clean it up?
Thank you for your response!