You may find that when you search for a particular website in a search engine you are redirected to a strange website which says that your computer is “Infected with viruses” - then you see a screen which looks like it is scanning your computer – THIS IS A LIE – your computer is not being scanned, it is an animated graphic not a true scan – DO NOT CLICK ON ANY BUTTON OR THE SCREEN – CLOSE THE TAB OR THE BROWSER WINDOW USING THE RED 'CLOSE' BUTTON.
If you are the owner of the website ask your web-master to view this video & clean your website files.
If you click on the screen or any of the false buttons a program is installed on your computer which continues to 'nag' you to purchase some anti-virus software – the solution is to “Restore” your computer to a previous day. (In Windows you can choose a “Restoration Point” Look in PROGRAMS > Accessories > System Tools > System Restoration).