Did you check with Sony to see if your laptop is approved for Windows 8.1 ? Some are not. Sony uses pripriatory graphics drivers and cannot use drivers from the AMD support site..I don't know about drivers offered by WU. After you check with Sony (not the Micro$oft tool) to see if your laptop supports 8.1 and have checked for bios updates, then uninstall the graphics drivers and reinstall the drivers Sony offeres for your laptop.
Intel I7 960 @ 3.87ghz *Intel DX58SO *AMD R9 290 4gb *Corsair TX650M *2x4gb Corsair XMS3 *WD Black 1TB *Windows 7 Home Premium 64bit ***Asus N71Jq laptop *Intel I7 720QM Processor *Mobility Radeon HD5730 1gb *8gb Ram *Windows 7 64bit ** Toshiba P75-A7200 * Intel I7-4700MQ * Windows 8.1 64bit
***** cetera fallunt, ludere mortuus ******