I dont know why there are three configure.php.

But it must be exsits when somebody get the problems as desribled above.

Go and check if there is a folder called " local" exsit under:

yourzencart/admin/includes/

and there is the another configure.php.

i know there is no such file in the default zencart files!

It may automatically come out during the copy process.

I mean i copy the all the zencart files from another exsited store.