How can i understand that my computer contain a virus?

How can i understand that my computer contain a virus? And how do i protect this?

How can i understand that my computer contain a virus?
Anti-Virus program. There are many free ones out there. AVG Free Edition... Avira AntiVir... Avast!.... Scan with them. Also, you know you have a virus when your files start getting corrupted... or when other people start complaining that you're sending e-mails when in reality you haven' sent anything... that's a worm.


Hope I helped.
Reply:If you use an Anti-virus, you can both scan for viruses and prevent from getting viruses. They can run from $50+ in stores but it's definitely worth it. For more information, you should go to your local computer electronics store and ask for their selection of Anti-viruses.
Reply:it usually becomes slow and sluggish


then it doesn't respond to commands and clicks


then your system dies





use free antivirus software from avg or antivir. and pair it with antispyware software from lavasoft or iobit.


good luck.
Reply:sorry i only know how to make them
Reply:get this:





http://www.grisoft.cz/filedir/inst/avg75...





and run a scan.





It is completely free.