Outlook 2002 won't send or receive

I installed Sygate Personal Firewall Pro to detect and block a Trojan. Now Outlook won't send/receive. Have uninstalled the firewall, done a "repair" to Office from the install CD, and many other attempts to figure this out. One symptom is when I "Test account" it connects to the network OK, but the "Find incoming" and "Find outgoing" are both canceled immediately and the test stops. When I click "send/receive", there is no activity on the internect connection. I haven't found any help from MS, Sygate, or my ISP. Can anyone suggest what is blocking my system?