Need help!

I keep getting this error message when I try to go to my site:
The requested URL /shop/zc_install/index.php was not found on this server.

I am totally ignorant when it comes to doing more than using the Shopping Cart so I have a girl who is trying to upgrade my 1.2.1 version of Zen Cart. She downloaded the site and that now we get this message. I can still get into my admin page. Any suggestions on what I need to do??

Thanks!!
Tamela

Have you recently moved this install from folder to folder or to another server?

And did you backup before doing any of this?

The girl who is supposed to be udpating the cart says that all she did was download my site to her computer and add a database. But after that the site stopped working.

I generated a full back up before anything was done.

The girl who is supposed to be udpating the cart says that all she did was download my site to her computer and add a database. But after that the site stopped working.
Was the DB backup applied to the DB on her computer?
Was the fix cache key run on her computer?
What error is generating if any?

Thanks guys! I finally found someone near me who knows Zen Cart and has lots of experience. I am going to let him deal with it! This is way above my head!

Thanks for trying to help me!!!