One, you will never re-compile the kernel nor compile a new kernel from the LiveCD. You can re-compile or compile a new one from an installed copy or if you are testing, from a vmimage.
First have you tried the ndiswrapper approach? Granted if you want to continue to use the Live CD approach, changes will be lost but..
Second, have you tried this:
rtl8192su_linux_2.6.0002.0708.2009.tar.gz - , Realtek, RTL8191S, RTL8191SU, Linux, drivers, for, Xtreamer, WLAN, USB, Dongle, antenna,
Upon examining the tarball, there is a nice little readme in there that should help you get going.
Lastly, If you've never compile a kernel before, I would warn you against doing so because it is a complicated process. A VERY general starting point would be here: Master Kernel Thread - Ubuntu Forums
This applies to compiling the 2.6.32 kernel. If you search the forums you will see the problems involved with things no longer working etc. so it is frowned upon. If your box becomes unuseable after doing a re-compile, you'll likely receive little or no help.