Wired and wireless issue

Hello,
so i dont have internet access on my pc i have 2 other computers that are getting access to the internet. its not working with the Ethernet or wireless, although everything was working fine the last time i used it. i did a system restore and that didnt work. when i run the trouble shooter it says "local area connection" dosnt have a valid IP configuration. i tried doing ipconfig/renew but it tells me an error occurred while renewing interface LAC unable to detect your DHCP. please help. thank you