If there's a restore point prior to your first installation, try rolling back to that.
Er, you could try copying the CD to the HD and installing from there. I don't know if that would work, but it must be worth trying.
If, for some bizarre reason, you have the exact date of the install, you could search for all files created on or around that date, and delete any Civ-related files.
I'm sorry that these ideas are a bit lightweight, but everything else I thought of you've already tried and/or Ainwood has suggested.
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