Adaware makes their product available free for personal use but they do have some fine print that you should be aware of. We took the liberty of making it a little larger so you wouldn't miss it, it's the red text below...
*Free for non-commercial use only.
For use in a commercial/educational/governmental environment or to purchase a registered copy of Ad-Aware and/or RegHance, click here.

We advise all business users who want to use Adaware to purchase a registered copy.