little problem

[Mauser 98K]

every time i try to host a Lan game the guest computer will join session and at the loading mission from server page it will hang and wont go any further, i happens on both computers, both are running winXP home and both have the firewalls turned off and antivirus too but still no luck, i have tried everything including turning of VON disabling tracers etc, even reinstalled but nothing.

please help.