well its an issue with compatibility between the nic and the router. i had this issue with the cisco switch. go get another nic and try it out, all i can recommend. in 20 years tech and network support day before yesterday was the first time id ever encountered this issue and here you are.
Sorry for delay in response. I've been feeding Ethernet wire through my attics 3 ft crawl space. Huge PIA! Anyways that's funny I have cisco router, but that can't be it because I connected PC via Ethernet directly to modem also and same thing, blinking yellow with solid orange, but no connection on windows 7.