hi have been having problems with lag for some time and decided to follow the advice and go to the preferences page and i adjusted something and now it wont load at all , says i need to update my graphics driver, is there anyway of resetting the settings on the viewer from here as it wont load at all ,, i did try and uninstall then install it again but sadly it didn't work ,, any help or ideas would be gratefully appreciated ,, and keep it simple im not very technical xx