If you are a regular computer and internet user, then there is more possibility that virus attacks your computer. Viruses mean the minute computer programs that are made to be dispersed from one computer to another in the form of E-mails, file attachments, images, greeting cards, sound or visual files. But its curable. Many software are there to avoid such viral infections. As Windows are easily affected by viruses, so here are some of the best online scanners to protect your PC.