When you run the program you can view a detailed list of the applications run at Windows startup. From that window you'll be able to manage them and choose the onnes you want not to be run.
It also offers some options to modify settings and make the startup more effective. Change the order of applications, assign preferences,...
Finally, the Windows Registry cleaner will definitely make your PC run faster and smoothlier than ever. Cleaning the registry is always welcome. It deletes unvalid entries and make it work better.
If you feel your Pc is running very slow and it takes along time to get started, Startup Booster can solve those problems in a snap.
Trial verison doesn't clean Windows Registry.