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Ad-Aware! Spybot is highly rated also but I've always found it confusing & this one is definitely more idiot-proof. I know there are other ways to get it but I don't have the direct link to the site so here it is through Download.com:
MindGoneHaywire is right that Spybot is a bit confusing, but in the spyware battle you need more than 1 weapon.

While Ad-aware is great, so is spybot in different ways. Spybot allows prevention by using the immunization feature that prevents spyware from getting onto your machine. However even running both of these it may not remove all of your spyware. I've had to manually go into computers and clean it out.

If you are using windows xp then right click on my computer and select properties. go to the system restore tab and turn it off. viruses and spyware will use this feature to restore the computer to a date where the spyware and viruses existed.

Also in windows xp/2000 if you have multiple user accounts on the machine run the removal tools as each user.

Microsft bought a company called Giant antispyware and now has a beta version available for free called Microsoft antispyware. goto microsoft.com click on downloads and search for this product.

www.grisoft.com has free antivirus software (or used to) but if is still not free buy it as it is the best antivirus software you can get for many reasons.

Firefox is a good alternative but some websites may not work properly with out IE.

Any more help let me know

Greg