I think that you messed up if you reformatted the "D" drive(partition). Had you just did "C" drive then all your files and stuff would still be in place but unaccesable till the pathes were changed back in the "C" drive.... In the reinstall everything would be as new on the "C" drive and to get the users and profiles you just need to recreate them and relink them back to the old "D" partition!