onepointone - 4:34 am on Sep 8, 2010 (gmt 0)
Cookie stuffing, parasitic toolbars, browser hijacks, adware, are all big problems which will cost you commissions. And most merchants, networks, and search engines could care less. But these all take place off of your own site. Nothing you can do on your own site to prevent this type of thing.
You can block bots or infected browsers, etc., but you wouldnt get anything from them anyway.
Its just the cost of doing business as an affiliate.