if your computer worked fine with the old driver then you can properbly download it somewhere on amd.com
Alternative the problem could be that maybe your antivirus program blocked the amd driver installation or somehow
the drier installation was not installed properbly.
On the page on amd where you find the drivers there are also a guide to how to 100% uninstall amd drivers before you install the new one.. maybe try to uninstall everything and intsall the driver again.
Had same problem with system crashing, unable to wake up from sleep...Wakeman error and whatever else from the Radeon software.
Used AMD's clean uninstall tool to remove all traces, then reinstalled.
Seems to have fixed crashes (but latest driver still causing directx crashes for the applications.)
I guess we have to wait on AMD for a more stable driver.