Which free antivirus is both effective and easy to download?

my laptop gets flooded with unwanted programs anytime i browse. i need to get rid of them. some of them just won't go.

Which free antivirus is both effective and easy to download?network

Below is a list of products including firewalls, antivirus, antispyware, etc. All are free.

ZoneAlarm Free Firewall

http://www.zonealarm.com/store/content/c...

Kerio Free Firewall

http://www.sunbelt-software.com/Home-Hom...

(Note: Use only one firewall)

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Spyware Blocker

This is free and requires you to check for and enable updates manually once a week or so. It uses no system resources. It blocks spyware before it installs.

SpywareBlaster (inoculates, not a spyware removal tool)

http://www.javacoolsoftware.com/spywareb...

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AntiSpyware Applications

SuperAntispyware

http://superantispyware.com/

Spybot S%26D (free version requires manual updating)

http://www.safer-networking.org/en/downl...

AVG AntiSpyware

http://free.grisoft.com/doc/20/lng/us/tp...

Adaware from Lavasoft (free version requires automatic updating)

http://www.lavasoftusa.com/products/ad_a...

(These programs can be run in Safe Mode after installation and updating)

Note: Adaware2007 for Vista is not due to be released until August 2007)