I wouldn't suggest any type of optimization program unless it stated it's for Windows7.
One thing these "optimizers" do is tune up Windows services. Windows 7 services are much different than any other Windows OS. There have also been file structure changes and registry keys that didn't exist in past version.
So these optimizer mark them for deletion or changes security that could prevent you from connecting to the Internet, compromise your security, and as stated earlier, completely hose your system.