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You must first Fully update win 8.1. Windows Update must say "There are no more updates available before trying to install any AMD driver. All 'critical' and 'optional' updates.
You neglected to tell us what APU/or Processor you have. Without that, i can't go any further. This is why we need the Exact model number of the laptop...w/info you furnished (Toshiba L50-DC) this pops up with specs nothing like your specs http://www.pcadvisor.co.uk/review/budget-laptops/toshiba-satellite-l50d-c-12x-budget-laptop-review-3625006/