Error on admin login

Current zencart version: 1.3.9h
upgraded through cpanel from fantastico, click install

I have searched through these forums and can't seem to find an exact answer as I think this situation might be a little more unique than others.

I have a current site running live through another server. Before this current site, I had zencart however lacked the basic graphic designing knowledge to get our site to the wow factor, which is why we hired someone else to build us a new one. While they did an amazing job, the front looks perfect however the back of the store is unmanageable. We are at the mercy at the web developer and have zero control at modifying anything at the back of the store. Our current site is ran through cubecart and it needs to go.

With that all being said, our web developer provided the graphics from our current site. I am currently tying to get back to my old site where my host (justhost.com) has provided me the IP address of my old site. I have already connected to my old site with a FTP program to get the new template going. My issue lies where I cannot access my admin panel when trying to log in and getting a 404 error code. It seems like I am doing something minor to not being able to access it, so if anyone has any thoughts I am open to suggestions!

current site: https://www.antifashionorganics.com (done with cubecart)
old site current location: http://69.175.111.50/~antifas1 (trying to rebuild with zencart again with our new graphics)

When I try to log into the admin panel, i was able to bring up the admin login page: http://69.175.111.50/~antifas1/zc_admin/login.php however after putting i my correct username and password, it gives me a 404 Not Found error and that error page, the address changed to: http://antifashionorganics.com/zc_admin/login.php?zenAdminID=f999e2c78ed3bfb55878e206ddc93f66

I am open to suggestions on how to successfully log into my admin on the old site while keeping the current site live while I get the old one rebuilt.

Thanks!

Unfortunately, you may need to start over. Fantastico is not a good product for initial installation and has NEVER been a viable upgrade method. There's no way that Fantastico can recognize any customization already in the existing cart.

Check the file zc_admin/configure.php to references to https://www.antifashionorganics.com rather than http://69.175.111.50/~antifas1 .

Also, you need to be careful in posting too much information on this forum. Even letting people know the URL of the admin login is a security risk. That infomation should be kept private. It is a development site I know, but still...

And what dbltoe says about fantastico is good advice :-)