Any company that offers a free software download then says that you have to buy their product after you have installed it is nothing short of a scam! There are plenty of other company's that don't do this & have better software.
RegClean Pro Review: RegClean Pro cleans invalid registry errors using its...
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Unwanted Software Uninstall Guide
1. Press the "Start" button. 2. Select "Control Panel". 3. Choose "Programs & Features" (or "Add/Remove Programs", on older systems). 4. Find the software you wanna remove in the list of installed programs, and select it. 5. Press "Uninstall", Alternatively, right-click the program and select Uninstall.