I am using Ubuntu 8.04 and when I open up my network settings, It shows my ethernet card and my modem but my wireless card doesn't show up.
Under "Hardware Drivers" it says that my driver for my wireless card is a "proprietary driver" and that there is no driver I can get for it for Linux. Is there any way that I can get my wireless card to work?
I tried going to the HP website and downloading a driver for it, but all of the drivers only work for Windows....

My only advice is try a newer distro. 8.04 is getting dated.

Previously madwifi was used for Atheros chips. This driver required a propriety binary blob. It has been supplanted with the ath5k and ath9k native kernel drivers. The ath5k is for Wireless G devices. The ath9k added support for Wireless N.

Look at the output of "sudo /sbin/lspci -v" and "sudo /sbin/lspci -n". The driver supporting the device may be given by the first command. The manufactures code is given by the second, if you need to do some searching on the net for more information.

It is possible that for your particular device, you need a newer kernel. Try modprobing one of these modules and see if a wlan0 device is created.