so i guess you have 2 wireless cards, one on every station...
on the host, put these settings in TCP/iPV4:
IP: 192.168.0.1
SM: 255.255.255.0
DG:192.168.0.2 (other's pc ip)
and, on the client, put these:
IP: 192.168.0.2
SM: 255.255.255.0
DG:192.168.0.1 (other's pc ip)
+
Lookup your ip address, the one that connects you to the wired internet, and enter it in the Preferred DNS field, on client machine, so:
DNS: xxx.xxx.xxx.xxx
also, you have to share your wired connection and allow it to be used by other connections
have fun