Problems with inbound connections

[PaulRyan]

I have several PCs in W2K3 SBS network. One machine has developed a
problem as follows;

1) file and print sharing is not working
2) I cannot remote desktop to it
3) I cannot ping it
4) all outbound connections are working fine

The PC is running XP SP2

I have tried all the obvious (to me) things;

1) there is not virus or malware (have done a full scan with norton
and hijackthis respectively)
2) there is no firewall issue (machine has same ruleset as other PC's)
and issue is the same regardless of whether firewall is up or down
3) RPC service is running
4) event log is running
5) running ethereal/wireshark I can see remote connections coming into
the PC on the correct ports but the PC does not reply to them
6) if I type in a share locally (i.e. doing \\machinename\ ) all
shares are listed
7) I can run an nmap port scan - it just returns the ip and mac
addresses and tells me all ports are filtered
8) I used MSCONFIG to reboot machine with the bare minimum of
microsoft services and the problem persists

Unfortunately this problem has been ongoing for a while now so do not
have a viable restore point. Can anyone suggest any other avenues for
exploration before I resort to a reinstall of windows?

TIA

 

[PaulRyan]

responding to my own post seems a bit odd, but nevertheless.....

If anyone else has similar issues, I fixed this by removing Norton
Internet Security 2008 and replacing it with AVG.

Norton certainly made my PC nice and secure, but could have achieved
the same result by turning it off and saved the company 30 notes in
the process!!