I got one desk top and laptop. Both connect to my Access Point through wireless. They used to work fine. Recently, my laptop can not connect to internet. While my desk top still works fine. The laptop connect to AP and the signal is good. However, I can not access internet service. The received package always 0. I check the drive of wireless card is normal. And try to verify all possible configuration of related setting but seems no use. My OS is XP. How do I check it out. Someone can advise. Thanks in advance.