IE can not browse !!!!

recently,my office have two pcs which is linked to network and joined within workgroup but only one pc can browse internet and other one can’t browse and can’t ping internet also even though both of the pcs can browse each other in network environment.The two pcs is using Windows XP with SP1 and IE6.0 with SP1 also.Is IE corrupt or some problem???I would appreciate if anyone can help me to solving this problem!!!

Thank you and regard
Wilson