[Help with Viewer]

Hello there, I recently joined Second Life, and the first time I opened up the viewer, I turned up the video quality settings.  Appearently, my computer could not handle this, as everything froze.  However, the quality settings are now set on high, and every time I try to log into the viewer it try's to render the world, but is not able to handle it.  Becuase of this, I am inable to log into the second life world.  It would be really great if someone knows a fix to this.

 

Thanks