The driver found in Dell website for Optiplex GX1 was not working on my computer. Goto Crystal Semiconductor and found the generic drivers for this CS4236b. Able to get it working so far.
a) you need two files (csbase.dll and csbase.sys)
I got them from here: http://ftp.ncnu.edu.tw/MsDownload/taiwan/nt4/sp3.cd/drvlib/audio/crystal/i386/
b) I wasn't any better than the MS driver that came with Windows, I still can't choose a recording input."
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