[Masterface7]

You need to first get titanium Backup from the market, it is free. Also you will need to download an alternative launcher and set it to default for now. I like launcher+ beta because it is small and called the "open source branch of the stock 2.0 launcher."
After you download and install a 2nd launcher (adwlauncher, home++, Launcher+ beta all options) If you still can't pick it when you tap the home button don't worry we will clear launcherpro from default next.

Next I went to, "settings>applications>manage applications>Launcherpro" Forced stop and made sure to uninstall any updates because I guess it auto updates. Also I cleared data and cleared cache and I cleared defaults.

Next, go into titanium backup and follow the on screen prompts then get the the 'Backup/restore' tab. Scroll down and tap Launcherpro then tap un-install!. When it is done reboot android.

When you boot back up you should be left with only the second launcher you installed and now you can install Launcherpro plus and uninstall the other launcher.

OI manager can be uninstalled like this as well both of these files just need a program that uses root access to uninstall them.