deleted all of my files on my registry cleaner

I made a big mistake and deleted all of my files on my registry cleaner and I cannot get my new system to recognize anything but Netscape and Explorer.

I have the setup disk from Dell but it will not even recognize the menu from the setup disk.
I am dead in the water.
It will not even recognize the reg cleaner.
It keeps asking for an association key.
What should I do now?

Please help.