Error when going to PHP page

I started off, with my php program in c:/PHP and it worked fine, but i wanted to rearrange aa few things, so i moved it to c:/usr/php, i edited my apache config files to the new dir, when i go to a php file, it says 404 cannot find file, even if i go to the directory index and click on it, it says that. I tried deleting the c:/usr/php dir, and downloading a new copy of the php binary to install, but it still gives me the same thing, ive restarted my server, checked everything in the server, done everything i can.. will anybody please help me. thanks stephen cross