Ad-Aware 2009 'Anniversary Edition' is shipped in three different editions, with the free version suitable for most home users. The latest version is built upon ten years of security development and is said to use 20% fewer system resources than the previous 2008 edition. As it's free, it's worth evaluating on your system to see how it stacks up against your current anti-spyware application.
Ad-Aware 2000 'Anniversary Edition' link.
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