I've had a LAN connection via Ethernet between my PC and a friend's laptop working for a couple of weeks which, until yesterday, has worked fine. A little background info, I set up the network as being hosted by my PC with the laptop as client. I realise now that was a bit silly, as only the laptop can get online via wireless, but it seems to have worked a treat anyway

However, the LAN connection now says it has limited/no connectivity. It still displays its 1Gps speed as usual, and access through My Network Places (for file sharing etc) is totally fine. But neither computer can see each other in a Network Game list, and the PC cannot get online.
I tried running the IPconfig commands in cmd prompt, disabling/enabling the LAN connection, repairing it, cold & warm booting, and combinations of the aforementioned to no avail. I've run out of ideas. I really should stop being lazy and join a computer class

It would be great if anyone can help!
Many thanks,
Kal