I uninstalled NOD32 v3.0 version 3.0.650 and it left a Trusted Publisher entry in Outlook 2007 under Tools, Trust Center, Trusted Publishers. I can remove the entry which is titled "ESET, spol. s r.o." by highlighting it and clicking Remove, but it always reappears when I exit and go back and view the trusted publishers again. Any ideas? Solved - run Outlook as an Administrator (Vista) and then you can permanently remove the entry.