Follow up:
Smitfraudfix scan/removal program finds nothing
AVG finds nothing
with the deletion of the autorun.exe which I DID run SSnD finds nothing
Trend online scan finds nothing

typing the phrase "cheese is good" in both Firefox and IE browsers in both user name and password fields, WoW login, in chat messages, and in an email then searching for the phrase in a file including system and hidden files yields no result of the phrase being logged.

Also, I've never shown any signs or symptoms of infection