Yes, it can. I don't know how though yet.
40% of computer users have been infected by a virus.
Yes, if the removable disk is connected to your computer then it will be infected.
They can only if they are infected with the virus.
No, you will not be infected in that manner.
no
yes
When you open a website or download a program that is infected with a virus.
Anti virus software has nothing to do with your wireless router (unless one or more of the system files responsible for network communications was infected). The only thing which can block network activity is firewall. Check your network and firewall settings.
Yes a virus can go through any network
Yes, most of the computer virus have security threat to the infected computer. If your computer has been infected with virus, you should remove it quickly.
norton anti virus of course
Yes, or moves them to a "Virus Chest"