Is there an antivirus program that will delete adware and viruses for free?

I am running windows xp and have recently downloaded several programs that say they are free but they only scan for free they don't remove anything. You have to pay for that service. If someone can tell me where to get a free copy of one that will remove the garbage let me know. If it works you will surely get ten points...

Please help I can't afford to buy one right now...

Is there an antivirus program that will delete adware and viruses for free?vista

1. Windows Defender from Microsoft - free http://www.microsoft.com

2. Avast antivirus - free http://www.avast.com

Is there an antivirus program that will delete adware and viruses for free?antispyware

spybot SD, yes it's free you can update it. you can immunize youre computer too. search for it on google
AVG Antivirus - Free Antivirus Software

(CNET: ''AVG Anti-Virus Free Edition is the most popular free solution available at no cost to home users and provides the high level of detection capability that millions of users around the world trust to protect their computers.'')

Ad-Aware - Free Antispyware Software

(CNET: ''One of the first applications built to find and remove adware and spyware, Ad-Aware 2007's excellent reputation is well-justified.'')

Spybot Search%26Destroy - Free Antispyware/Antitrojan Software