my pc is conneted to internet via a TP-link modem through usb port. and my pc is connected to a router. so i am the host. 3 other pcs are trying to use internet via router and my pc. I tried sharing my internet connection but they can't use my internet connection. some errors like "this computer is connected to multiple networds" and "no network is set to home network" appears when i trubleshoot my network. can any one tell me exactly what to do step by step? BTW i am using windows 7.

Did you setup ICS? If yes, could you please post the result of ipconfig /all of the ICS host here? Or this post may help: Solved: Windows 7 - Internet Connection Sharing - http://chicagotech.net/netforums/viewtopic.php?f=2&t=14525&p=21169&sid=c9c6ee0c97f6f33207768db4b89d0ed5#p21169Bob Lin, MS-MVP Networking, Internet, Routing, VPN Troubleshooting on http://www.ChicagoTech.net How to Setup Windows, Network, VPN & Remote Access on http://www.howtonetworking.com