click start
click programs
click accessories
click system tools
set a system restore point
then
click start
click run
type regedit
search for the above key for bts and delete that and only that
close the program
restart the computer
try to install...
edit:
you need to uninstall and reinstall civ4 as well though since the bts installer will not put bts anywhere else then the civ4 install path - so if you want to move from the external drive you need to move civ4 as well...
click programs
click accessories
click system tools
set a system restore point
then
click start
click run
type regedit
search for the above key for bts and delete that and only that
close the program
restart the computer
try to install...
edit:
you need to uninstall and reinstall civ4 as well though since the bts installer will not put bts anywhere else then the civ4 install path - so if you want to move from the external drive you need to move civ4 as well...