This thread was quite helpful, although the .rar files I downloaded were corrupt. Here is what I did to make it work for me. Go to
www.lsi.com and download the Megaraid 320-2e driver. Unzip it and open the oemsetup.ini file in notepad. Find the line in the section with all the ExcludeFromSelect's that reads:
ExcludeFromSelect = PCI\VEN_1000&DEV_0408&SUBSYS_00021028
Delete that line.
Further down, look for the section titled:
;MegaRAID PCI Express(TM) ROMB
It will have two entries. Add a third line:
%mraidPCIEROMB.DeviceDesc% = mraid35x_Inst, PCI\VEN_1000&DEV_0408&SUBSYS_00021028
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Basically what you do is tell the LSI driver NOT to ignore the Dell version of the card (by deleting the ExcludeFromSelect line) and then tell it to treat it like the MegaRAID card, by adding the line further down.
Use the modified OEMSETUP.inf file along with all the other LSI driver files and it will install successfully on an existing WinXP setup. (You will get the warning about the driver not being Windows certified, but ignore it). You can also copy the driver files to a floppy along with the modified inf file, and hit F6 during a new install, and it will work there too. Good luck!