Unable to login after re-install URGENT

[yournamehere]

Hi,

I had to reinstall our website after the installation of a module (the homepage flash carosel) brought up a hack attempt message.

I had to delete everything off the server and then reinstall the whole lot and then in the the settings.inc.php file change the database prefix to that of the backup i made. So i had a new installation with the old database (both from prestashop 1.0). After doing this the front end appears fine, but the back-end will not let me login with any of the usernames i have.

The accounts still exist as i have found them in the ps_employee database.
BUT when i ask to email to password to me, this message appears:
Error - The following email template is missing: password.txt

I have checked the mails folder and password.txt plus password.php exists...

So why can't i login?

[Rémi Gaillard]

Switch your new COOKIE KEY on your settings.inc.php by the older, or in the table ps_employee change your password by:
MD5 (COOKIEKEYyournewpassword)
like MD5 (KdqeQagpW57jnPZC9mqTW7bXPMghDs5haxnivrvrJRyVEv7m6Kb1qceNmynewpassword)
if your cookie key is: KdqeQagpW57jnPZC9mqTW7bXPMghDs5haxnivrvrJRyVEv7m6Kb1qceN
and you want mynewpassword for password