If you're getting a message telling you that your computer has loads of errors, it's almost certainly 'adware' which has found its way onto your computer, which is trying to get you to waste money on something which you don't need.
Download, install and run the free version of Malwarebyte's Anti-Malware to get rid of it:
http://www.malwarebyt...cts/malwarebytes_free
Chris