Please download and run MemTest86+ to test your RAM. RAM tutorial with Memtest86+
Run MemTest86+ for at least 8 passes. Ideally set it off before you go to bed and leave it overnight, we're looking for zero errors here. A single error will show something's going bad with your RAM.
Please try to remove the Catalyst Control Center and only install the Display Driver
3: kd> lmvm atikmdagstart end module name
fffff800`770c0000 fffff800`785ca000 atikmdag T (no symbols)
Loaded symbol image file: atikmdag.sys
Image path: \SystemRoot\system32\DRIVERS\atikmdag.sys
Image name: atikmdag.sys
Timestamp: Thu Jul 16 03:37:09 2015 (55A70AC5)
Translations: 0000.04b0 0000.04e4 0409.04b0 0409.04e4
Please read and run driver verifier after running MemTest86+ and removing the Catalyst Control Center.
Please make a backup of your important files and get your rescue media or create one
Please create a restore point.
Some windows drivers are blamed in a few crashes, but that usually means that a 3rd party driver is actually the cause.
In order to get the driver, we need to stress it out, done via driver verifier. If driver verifier finds a violation the pc will crash.
If driver verifier has found a violation and you can't get back into windows normally, try to boot into safe mode and reset in safe mode driver verifier, or in the troubleshooting options open command prompt and type verifier /reset.