The .zip isn't the one you want. You need to be rooted for that one. You the apks from this thread which you can use Astro file manager to install. Make sure you have unknown sources checked in your applications settings.
[Hack/Re-Release] Samsung Galaxy S LWPs (Non-Root) - xda-developers
Save them to your sdcard, open Astro and select it, select open app manager, then select install.
Thanks. I really appreciate it.
I have "Unknown Sources" checked in Applications, but when downloading the .apk, it says: "Download unsuccessful. Cannot download. The content is not supported on this phone."
It's not a big deal to me, so don't worry about trying to help me more. I'm tired and need to give up and go to bed. Thanks for the help, though