avira free antivirus
Avira AntiVir is a free antivirus software for home use. It is an alternative to avast and avg. It does not provide much but it is a ligthweight protection software for your pc at home.
antispyware
spybot
Spybot is a very nice antispyware
It removes spywares from your computer that is not detected by many antivirus programs.
These spywares comes with some of your trusted software too. But in many cases you do not even realize that your computer is infected. Spybot is effective against malwares and worms too. Spybot supports many languages as well.
Avast! Home Edition
FREE antivirus software with spyware protection: avast! Home Edition
Complete antivirus software for free
avast! antivirus Home Edition represents the best FREE antivirus protection currently available on the market. This edition is FREE OF CHARGE for non-commercial & home use only. Both of these conditions should be met!