Go in to the Applications, and search for NDISWRAPPER.
ndiswrapper is a tool in Linux that allows Linux to use a Windows driver for the network card, because of the Linux driver being unsupported for the network card.
See if your card is listed on supported cards on the ndiswrapper site: http://sourceforge.net/apps/mediawiki/ndiswrapper/index.php?mediawiki/index.php/List
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Follow instructions here, steps 1-4: https://help.ubuntu.com/7.04/internet/C/connect-to-internet.html#wireless-ndiswrapper
And here: https://help.ubuntu.com/7.04/internet/C/connect-to-internet.html#internet-basic-procedure
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Let me know how it goes.