To uninstall a program from your computer go to “Start”, select “Control Panel” and open “Add or Remove Programs”. There you will find a list with all the programs installed in your computer and you can remove any one of them, including SweetPCFix.
You can also try a program that removes any application from your computer, even the ones that you can not remove with the classic uninstall solution. My personal choice is Revo Uninstaller. You can find more information about this product at http://revo-uninstaller.software.informer.com/