Microsoft Windows XP Home Edition "clear upper lower filters" Questions

...upper and lower filter needs clearing. Click on Start --> Run --> and type in 'regedit'. Upon entering, expand the "HKEY_LOCAL_MACHINE" >> System >> CurrentControlSet >> ...

...clear it and type in Regedit then Click on OK or Press Enter- Regedit Windows will open-follow the path - click the + or Arrow on the left of the path > ...