Originally Posted by mn331

No need to reset. Only one condition is to have your phone connected and signed in to Google account.
Clean up your Home app data is all you need. You will loose your icons on your Home screen, nothing more.
Step by step:
Use your Google account and login to Android Market web.
Find and install your second Home app by pushing it into your phone from the web. I personally preffer GO Launcher EX.
If installation succeed, lock and unlock or restart your phone. Then you should see the dialog of switcher of default Home app.
Do not set any app as default, you will make it later! Choose your second Home app, and woala, your phone is working again.
Go into the Settings menu and follow: Applications - Manage applications - All and find your primary Home app, wich is Samsung Home in my case.
Tap on this app to get info about it and force it to stop. Finaly clean up the cache and the data.
Now you can use the Home Switcher or the Home Manager app to manage your default Home app.