If you have connected the two together, have you:
- given each computer its own name, but put both in the *SAME* Workgroup?
- allocated an IP address in the TCP/IP settings of the network adapter in each PC? If not, give the PCs the IP addresses 192.168.0.1 and 192.168.0.2 with the *SAME* Subnet Mask of 255.255.255.0
- configured any firewall software to allow the networked computers to communicate by entering their IP addresses into its "trusted" area?
- set any folders that you want to have avaailable over the network as "shared" in their Properties?
This assumes that you are NOT using "Internet Connection Sharing". If you are, enabling ICS on the actual internet connection would configure the Local Area Connection with the IP address 192.168.0.1 and the "client" PC would be set to get its IP address automatically, which it does by DHCP from the "host" PC.