Avast Free Antivirus
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Full user review
"Best in class"
To people posting slowdowns and those sorts of issues, please read Avast engineer's report "How to Make the Full System Scan 6x Faster..." here http://blog.avast.com/2010/04/25/how-to-make-the-full-system-scan-6x-faster-in-10-days ...
If you read the instructions on their site before configuring the product and stay up to date by putting the Avast Blog on your must-read RSS Feed, this will take some time but it will allow you to use the product efficiently and effectively.
If you encounter a serious issue that isn't addressed by the usual methods noted on their web site and you've taken the precaution I mentioned above, before ditching the product, please phone their dedicated tech service line for free support. Its number is listed on its product page on Avast's website.