If you set the IP and such for either you may have a BAD DAY. When I work this I had to be sure that DHCP was working and I did not manually assign the IP and such. Also I can't have WiFi enabled and plug in the Ethernet. That's not supported (that is, not automatic so I'll call this advanced networking which I won't broach here.)
I'd unroll what you did and test with another PC.
Also, be sure the router's firmware is their latest.
I have a linksys wrt54g v6 and it will not let lan access internet but gives wifi a perfect IP. The pc gets addresses from anything else I connect to ethernet so I know trouble is with router. I uninstalled lan reinstalled updated drives. reset router. I even copied the IP address that the router gave to wifi. so a working subnet, gateway, and IP on ethernet and it still said unidentified network. put exact same numbers back in wifi and yep worked just fine, how can it give a good address to wifi and bad to lan on same pc? and how can address work on wifi not lan. cant get my mind around that! but realy the unidentified network error is the dumbest thing I ever heard think about it if I plug a cable into my computer by definition its identified. I know exactly what I connected! besides I bought and paid for pc who has right to tell me what I can and cant connect it to I don't need it to identify anything I just need it to connect. is that to much to ask? any help getting a working IP on this before I smash it I would be gratful for. thank you