How can i deduce that my computer contain a virus?

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

Answer:
Anti-Virus program. There are many free ones out near. AVG Free Edition... Avira AntiVir... Avast!. Scan with them. Also, you know you own a virus when your files start getting corrupted... or when other people start complaining that you're sending e-mails when within reality you haven' sent anything... that's a worm.
Hope I help.
sorry i only know how to cause them
If you use an Anti-virus, you can both scan for viruses and prevent from getting virus. They can run from $50+ in stores but it's conspicuously worth it. For more information, you should go to your local computer electronics store and ask for their test of Anti-viruses.
it usually becomes slow and sluggish
after it doesn't respond to commands and clicks
later your system dies

use free antivirus software from avg or antivir. and pair it next to antispyware software from lavasoft or iobit.
good luck.
catch this:

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

and run a scan.

It is completely free.
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