In order to uninstall BearShare you can follow this steps:
- if your operating system is Windows Vista or above you can go to Start > Control Panel > Programs > Programs and features. Select from the list the application and click Uninstall.
- if your operating system is Windows XP or bellow you can go to Start > Control Panel > Add or Remove Programs, select the program you want to uninstall and click the Remove button.
Also you can try Revo Uninstaller. Even if it can't uninstall the application normally, it will force it to uninstall by wiping out all traces of its presence from the system.
After that, try running AdwCleaner to make sure that there are no leftover rogue registry keys or toolbars in your system.