Free security programs for your computer

Ad-aware
Ad-aware is a great program for cleaning out spy-ware from your computer.

Ad-Aware

There is a pay for version that has a few more bells and whistles, but this link is for their free version that does everything you will need it to do.

AVG Anti-virus

Grisoft has a great free antivirus program. Like Ad-aware, there is a fee based version, but their free version will take care of you system.

AVG Antivirus

Zone Alarm Firewall

If you are looking for a firewall above what comes with Windows XP, then check out Zone Labs free Zone Alarm firewall. Just like the other, they have version and suites that you can buy.

Zone Alarm