I had a major problem earlier with the Windows 10 Anniversary Update.
The day before it got installed everything worked fine, but when it was applied I couldn't use my start menu and any other applications.
Because of this update I had to Reset my PC which is a Lenovo G505s.
After Resetting all my apps were gone from C:\ but everything worked perfectly.
The other day when I booted up my PC I first encountered with the atikmdag.sys BSOD on startup.
I went back to a Restore Point I made after Resetting.
Everything worked again then later the same issue happened after watching a video.
Later I uninstalled all AMD drivers and Catalyst too in safe mode the re-installed them in normal mode with the auto-detect software.
The current version is Catalyst 15.7.1 for me. This is what the auto-detect software installed.
After all these I didn't have any problem on startup. But later it happened again when I was playing a video game then it was a sudden black screen followed by the BSOD with the same atikmdag.sys error.
Here are my system specifications:
CPU: AMD A8-4500M @ 1900MHz
VGA: ATI/AMD Radeon HD 7640G DDR3 SDRAM (768MB)ATI/AMD Radeon HD 8500M SDRAM (2048MB)
OS: Windows 10 Professional (x64) (Version 1607)
MOTHERBOARD: AMD A76M (Bolton-M3)
Thank you for reading through, I tried to write as detailed as possible.
Also sorry for any grammar mistakes, english is not my native language.