Hello,
1. Double check your IP address by running ipconfig from a command prompt.
2. Since it is wireless make sure you have not connected to another wireless network by mistake.
3. If the card cannot ping it's self then TCP/IP may not be properly loaded. Go to the network cards properties and remove TCP/IP. OK the change then go back in and add it back.
4. You could have a conflict with the internal port being set for 192.168.1.104 even if it is not active.
5. Check to see if NetBIOS protocol is loaded for the adapter if you are tryiung to connect to a windows network.
6. If the ipconfig shows you to be on another subnet 169.254.0.X go in to the properties and give it a static IP on your network confirm you can connect then reset it back to DHCP and it should pick up the router correctly.
Post the results from ipconfig if you are still having problems.