Any firewalls running?
Set any folders to share?
When faced with a login box I usually put in the user name of the computer I am trying to access.
I've set up a home network using my work laptop, called MSHOME. I can see the other machine in Microsoft Windows Network both ways - between PC and laptop. When I try to open the machine, I have to log on.
The PC is called ORANGEROOM and the laptop is LAPTOP28. My log on username for both machines is "cool". When I try to log on to the laptop through the network, by typing in "cool" with a password, it changes to ORANGEROOM/cool but won't log on. When I try to log onto the PC from the laptop, I again have to log on and I get an error message:
The username you typed in is the same as the user name you logged on with. That user name has already been tried. A domain controller cannot be found to verify that user name.
I'm running XP Pro SP2 and would really appreciate some help!

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic