Hi, I've seen similar problems in this forum but not the exact same thing. I upgraded from Norton Antivirus to Norton Internet Security 2006. I use the firewall, antispam and antivirus. Everything works fine for a couple of days, then the following problems occur: - Outlook will not send or receive messages, says it can't connect to server - Word, Powerpoint, Excel will not start until I kill the Norton antivirus task - Norton Internet Security will not start The problem disappears when I unstall Norton. This problem is reproducable with both Office 200 and Office 2003. One other thing I notice is that the first Virus scan says it has removed a virus - I beleive that this is a false signature. Don't know if this is related to the subsequent problem. Any suggestions would be appreciated. Thanks.