Toshiba laptops need driver from Toshiba's support website, including the two graphics chips. The driver from AMD is wrong, those drivers are only for aftermarket retail PCI/PCIe cards like the one in your desktop computer.
Go here and enter your laptop's Serial Number which is printed underneath. That will be much easier than drilling down through several boxes to get to the right model: http://www.toshiba.eu/innovation/generic/SUPPORT_PORTAL/
Or just click "Auto Detect".