Any workplace I know logs locations not on that machine but on their router then to some logging software. You need to find that machine and clean that too.
Use http://www.nirsoft.net/utils/pspv.html to find the unexpected that I often win a bet on when people claim they got it all.
With a CleanU--.bat file and a great step by step process from -----start.com, even those who incriminate themselves can leave barely any tracks of internet history at work!
Thanks Jimmy, you finally came through!
(this forums should have a moderator who filters through threads to make sure that they are kosher [before theyre posted]...you know, since cnet has so mny guidelines and polcies.)