Ok, i c. You have (im assumeing dsl or cable, that doesn't matter) but you have a modem and your switch is plugged into that. So the reason your Ip address is 81 somthing or other, is that address is issued by your ISP. ISPs usually allow 1 or 2 different address(mac address) so you have all those filled up. To fix this, you should go to newegg.com or your favorite computer store and buy a router. your router will have an internet port and several computer ports. The router will act as 1 computer plugged into your internet. and "hide" all of your computers from the internet(this is called NAT{network address Translation} or a subnet). The router will be assigned that 81.83.229.232, and all the pcs you plug into it will get a 192.168.x.x number. This should fix your problem. Also, Very Important. You will need to do an ipconfig /release on all of the computers prior to installing the router. So, ipconfig /release, then un plug the swithch and plug in the router.