To uninstall this program click “Start” and select “Control Panel”. From “Control Panel” you have to open “Add or Remove Programs” which list all the program that are installed on your computer and give you the option to uninstall them. You can select each one of them, in your case Bearshare , and remove.
If this uninstall option provided by Windows does not finish the task with success, than use a program which is made in the purpose of removing unwanted applications. A program that is made in this purpose is Revo Uninstaller. You can find more information about this tool at http://revo-uninstaller.software.informer.com/