Trying to connect to a device based wireless set up on a ship
I would presume from what we are seeing in the WiFi menu that the Mac is connecting but not being given an IP address by the Windows 7 laptop. It's hard to know exactly without also seeing the "Network" preference pane with WiFi selected.

Check this article on sharing an internet connection on Windows.

You might also check that the WiFi on your Mac is set to use DHCP to get an IP adddress. In "Network" preferences click on the WiFi network then click the "Advanced" button and in Advanced click on "TCP/IP".



Make sure "Using DHCP" is selected.