>>Unless there's unique touchpad functionality, plug the wheel rat in, delete the current rodent from the Device Manager, and reboot. When it detects the mouse, it should see the MS mouse and install the standard MS drivers.
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>I did that. No dice. Funny though, after doing that, there are no files listed under drvier files. Thanks for the push- any more suggestions?

Other than doing Add New Hardware Wizard and pushing on the desired drivers by hand, not a single one. I guess that's next, just do the old "No, I want to select the hardware from the list", and pick Mouse, Microsoft, Microsoft PS/2 port mouse and go...