First did you set a fixed ip adress on both computers ? If you didn't, try setting : - first computer : ip adress: 10.0.0.2, subnet 255.255.255.0, no gateway - second computer : ip adress: 10.0.0.3, subnet 255.255.255.0, no gateway Second, did you disabled XP Firewall if you've got SP2 ? Third, if you can't ping correctly don't try modifying netbios etc... because if ping doesn't work, you won't connect to the other computer. The problem can be the crossover cable, networks card (not very often), networks drivers.