Posted 07 December 2008 - 07:00 AM
There are two networks you must consider. Your local LAN consists of your laptop, the PC under consideration and your router (and possibly other devices plugged into your router that you haven't mentioned). The LAN is 'supervised' by your router. That is, it supplies the IP addresses to the devices on the LAN and all traffic goes to and from the router's IP address.
The second network is the Internet. Only the router talks to the internet with the IP address assigned to it by your ISP.
From your PC, you should be able to see the devices on your LAN. Go to My Network and see if the laptop is visible. In other words are you connected to Local. I think you can see the same thing if you hover over the Network icon in your Tray. Normally it will say Access: Local and Internet but could say Access:Local.
If you have no access (Local or Internet), your problem is likely in the PC. If you have Local access but no Internet access, you should look at the communication to the router. Perhaps you have misnamed the your network or something like that. Use your laptop to sign on as admin on your router and make sure your PC has not been excluded or something. I am on Vista so and I can't remember all the details but you should be able to see your PCs network configuration somewhere. Try the Network icon in Control Panel or perhaps look at the network devices in Device Manager.