What is a companion virus?

Yup. In the general sense of the term "virus" (any malware that can be installed on a computer), there are some kinds of malware, usually called downloaders, which can actually download more malware...

Use a good antivirus to know if you have a virus. Examples are: Avira uit Duitsland avast! uit Tsjechië BitDefender uit Roemenië Computer Associates uit de VS ClamAV - GPL ClamWin - GPL ClamAV voor...

if you want to remove a virus go on full system scan and go on scan detials and where it says disinfect and quarentine go on the drop down window and click remove... i hope this helped

There are a few computer viruses that actually remove other viruses from computers they infect; the most common one is called Netsky (though its creator actually named it Skynet). They were written...

The following site says there is a virus Called mIRC/Dolly. http://www.pandasecurity.com/homeusers/security-info/25403/mIRC%2FDolly/