Hmmm... It may not be possible to not install catalyst when using the driver package from AMD, and I do see a note about the latest release NOT being compatible with Toshiba, but there are some drivers listed on the Toshiba site, three versions all from 2012. You might ask someone who knows about this stuff to try to help you with rolling back to an earlier driver and see if that works. If you were local, I'd help you here, but I won't do it long distance because I can't do any of the precautionary steps from here like making a ful backup. Using the wrong drivers can do really bad things and you need to know what you are doing and plan for failure.
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