The best way to determine how to get your wireless adaptor to work is to open a terminal (Accessories -> Terminal) and type 'lspci'. In the output of that, look for an "Ethernet controller" entry that looks like it could be wireless (has stuff like 'wireless' or '802.11g'). Paste that line here.
I expect, though, you may have to use ndiswrapper, for which you will need the original driver CD.