seem to be the number 1 reason for networking troubles. Try turning them off until you get going.
I have 2 PCs, connected with network.
I formated them both, and installed XP.
I ran network setup wizard on both, in computer A it failed and in computer B it succeeded.
So I had to set up manually ICS for computer A because A connects directly to the internet.
Now both PCs have Internet access and can see each other, but computer B cannot access shared folders and printer on computer A because it asks for username and password for the COMPUTER (not the FOLDER).
It is important to say that computer A CAN access computer's B shared folders WITHOUT a password.
I tried to run network setup wizard again and again but it failed!