At friend's restaurant where he has a WiFi. Everything on it works great (many systems/ credit card devices/ etc.) Router is Linksys and about 4 mos old. Then main pc in his office would lag bigtime when going online. Eventually over about 3 days it died. Looking as his usb WiFi device it looks like it got bumped under the desk. So I come in with a spool of cable and build a 150' long ethernet cable for him. I can only get about 1-10 kbps datarate out of this thing. So I move his workstation up to the router and plug it into a 10' long ethernet cable that I know is good. Now I have no datarate at all. Can't connect with either USB or Ethernet. What's goign on here? What else in a pc is dependent here? TIA!