I deleted my php files

[sannpeters]

I (accidently) deleted all the php files on my server (not the folders, though.) I've now replaced them, set the preferences to 755 and tried to open the install.php to start again. But cannot get in. I am getting both a 403 and a 404 error. (I have also tried 777 but no success there either.)

As I have a lot of images already uploaded, and customers with their user names already established, I was hoping that I could just re-set everything to as it was before.

What should I do? Start from scratch?
Any help greatly appreciated.

[Nibbler]

Don't run install.php, just reupload the files and reset include/config.inc.php to point to the database.