I went to the M$ site and grabbed ActiveSync 3.7. I think the actual install file is corrupt because it wouldn't install no matter what I did. Reinstalled the original ActiveSync (3.5) from my cd and after a bit of messing with it, finally got back in sync with my new baby. *whew*!
My guess is it's ActiveSync 3.7 that's the culprit. But that IS just a guess.