viper, a cousin of mine used spysweeper & it causes quite a number of problems including refusing chat progies to do file transfers & also problems for some e-mail clients (sorry, can't remember the name). moreover i find it to be unfriendly (it claims simplicity without being simple, not much options).
Spybot S&D is still my preference as it's totally free; personal & commercial. Ad-Aware however is not free for use at work. <img src="/ubbthreads/images/graemlins/down.gif" alt="" />
*janggut is a cheapskate* <img src="/ubbthreads/images/graemlins/rolleyes.gif" alt="" />