set a system restore point
then click on the windows button on your desktop
click on search
type regedit
in the program that opens use ctrl-f to search for all entries with
civilization 4
beyond the sword
warlords
CFBCE791-2D53-4FCE-B3FB-D6E01F4112E8
3E4B349F-10B5-4586-9D99-489A90A8B228
and
32E4F0D2-C135-475E-A841-1D59A0D22989
and delete all those entries.
close the program, restart the computer, try to reinstall...
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