Please can you let me know why I am being told the below - and how I can go about fixing it, as there is no virus on my PC?
"Unfortunately, your computer may be infected with a virus.
Don't worry. We'll help you find and remove any infected files right away."
Often, users who are infected with malware are tricked into running a malicious program, which infects their machine with malware. Remember, you should never run programs from sources that you don't trust."