hey.. i have a netgear usb adapter, and my friend has a lynksis pci card, both on a newtork with a lynksis router. for some reason, i keep getting kicked off and get a "wireless network unavaliable" message. sometimes it'll be stable, sometimes it'll boot me off again and again. is this soley a signal strength problem, and do i need a pci card w/antenna to help? or is there something else i may be missing.. thanks