Only two things come to mind which might cause this:
1)Failure to rollback SH3Cmdr before unistalling SH3 (if you use it)
2)SH3 folder in My Documents is still present.
If neither of these solve your problem then I'm actually out of suggestions.
Maybe wait for Jscones or Kpt.Lehmann to see your problem.
EDIT - Have you checked the MD5 hash? However, I'm not sure if this is relevent with a single zip download, again I would wait for JS or KL to check in to answer this point.
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