If you have the software installed, start it and use it cleaning modules. However, according to various websites found on the Internet, the Fast Clean Pro application is considered to be Rogueware. I recommend requesting a refund for your purchase (if you still can!) and then use something else that you can trust to use. I recommend CCleaner or TuneUp Utilities (first is free, second is shareware).
CCleaner should do the necessary cleaning procedure by uninstalling unnecessary apps, cleaning the registry, or removing the temporary files from your computer.
