My computer is infected in what website can I download 100% free anti virus soft ware?

but iam having already an antivirus but it says its not updated

My computer is infected in what website can I download 100% free anti virus soft ware?photoshop

open in google seach-Download Avast Antivirus FREE.

My computer is infected in what website can I download 100% free anti virus soft ware?symatec

http://free.grisoft.com/ (AVG)
To keep your Windows PC secure, you need more than just virus protection- you need a firewall and spyware protection. If you need freeware security applications, you can choose from the following:

firewall: (listed in order of preference)

Comodo (http://www.comodo.com ), or

PC Tools (http://www.pctools.com/firewall )

Comodo recently released version 3.0 of its firewall, which adds an intrusion prevention component that's very effective, though it does take time for it to learn your system, and requires some ongoing attention by the user to make sure programs don't get improperly blocked. Comodo is one of the strongest firewalls available, freeware or commercial, according to the independent testing site matousec.com.

antivirus: (listed in order of preference)

Avira (http://www.free-av.com )

AVAST! Home (http://www.avast.com )