Computer question

[Kathryn]

 I have a software problem and I'm hoping one of you technically minded
people out there can help me.

I tried installing CivIII on  my system (I've had it on there before so I
know it works) and it crashed my computer. Since the start up program was
causing things to freeze I couldn't uninstall it properly so I simply
deleted the folder that it had been installed in (which was stupid I know
but it's way to late to do anything about that now). My problem is the
CivIII setup program refuses to believe it's not still there. It gives me
the options to play, uninstall or reinstall. Play doesn't work because it
can't find the files (not surprising since they're not there), uninstall
thinks it's working but doesn't actually do any good, it tries to uninstall
gets to 1% done (giving the file WINNT/CivilizationIII.exe. as the file it's
deleting) then jumps to 100% done and says it's finished, but the setup
program *still* thinks it's already on my system. Reinstall does the exact
same thing as uninstall. I've tried several times, tried hunting down any
civilization or infogrames files using search, restarted half a dozen times
- nothing works. How do I either convince it that it really is gone so I can
install it again or force it to reinstall?

Help. I just bought the expansion for it and I *really* want to play it.

K