Hi,
Read this whole message before doing anything...
Assuming your current router setup is at (turn off xbox for now, and probably disable the ICS if you are doing this from that same PC) 192.168.0.1 you type that in from your browser's address bar, and press enter.... You should be greeted with the DLink router sign-in screen. I think the default username is admin default password is password (you should change the default password to some other word for your router's security).
Click on the SETUP tab, then click the LAN item on the left. You shouldnow see the LAN setup page. Change the router's IP address to some other besides 192.168.0.1 I use 192.168.1.1 Then below on the page, change the DHCP settings from the 192.168.0.2 etc to match whatever you chose above for the Router IP range, that being in my case, 192.168.1.2 to 192.168.1.254 You do not need to go as high as .254 in most cases, but I chose to do so in my case.
SAVE Settings then Reboot the router from the TOOLS page, SYSTEM item
You will likely have to reboot any PC's connected to the router as their internal IP's will likely change due to the newly assigned DHCP IP range.
Your new router's IP address to go back into setup, would now be (in this example) 192.168.1.1 don't forget that little detail..... in case you need or want to go back and make further changes...
Then go back and re-enabl;e the ICS on the PC you intend to share to the Xbox360...... You may well need to use an ethernet crossover cable to get the Xbox online (often these are yellow, tho I am not sure why).....
SD1