Hi there and welcome to my free anti-spyware page,im going to list some of the best free to use antispyware programs for you to download,please remember to update these regularly to keep them getting rid of the latest spyware threats.
these are all full free to use downloads.with no time restrictions

Ad-aware Personal http://www.lavasoft.de/products/ad-aware_se_personal.php

Spybot -S&D
http://www.safer-networking.org/en/index.html