First, there are no latest Omega drivers. The file he distributed to mirrors is not complete and can't be opened. You can use try the latest ATI drivers. This is the last set of drivers with only the simple control panel available. All future drivers will use the CCC only.
Only the control panel needs to be deleted. You can simply overwrite ATI drivers without deleting them, unlike Nvidea drivers.
If you don't like the new driver, delete control panel and reinstall your omega driver, since you should still have the download somewhere. You don't need to do a system restore.