Use spy bot search and destroy or adaware. They are well known. ALWAYS look up programs in wikipedia AND google before you install them. MANY registry fixers and spyware removers are spyware themselves.
Cnet link to download adaware for free. http://www.download.com/Ad-Aware-2007/3000-8022_4-10045910.html?part=dl-ad-aware&subj=dl&tag=top5&cdlpid=10045910
cnet doesn't mirror the download so here is the main page for spy bot
and microsoft aslo has one called windows defender.