Explain the examination of computer viruses via the Internet (Online)

   There are some online sites that provide scan your computer from viruses and malware service, On this subject will recognize the site bitdefender company that provides you with computer screening service and make sure it is free of viruses for free.

so  access to the site "quickscan.bitdefender.com" and then press the "scan now", after the piece will show you the message to add the program to your internet browser and then asks you to reboot your browser. Restart it.