As far as I know that in order to protect our computer from viruses or any other kind of malicious objects you should install updated antivirus program or firewall. The antivirus program only capable of removing those suspicious objects. Otherwise I should use alternative security programs like adware or malware remover, spybot remover etc. But still I am asking is there any way to remove the virus that has been infected in our computer without the use of or installation of antivirus program? If this is possible then how can we do that?