BSOD playing games, listening to music - still trying to understand

Hello Luidig, it is caused by the display driver.

Code:

fffff880`0a6cc2a8  fffff880`04cf1821Unable to load image \SystemRoot\system32\DRIVERS\atikmdag.sys, Win32 error 0n2
*** WARNING: Unable to verify timestamp for atikmdag.sys
*** ERROR: Module load completed but symbols could not be loaded for atikmdag.sys
 atikmdag+0x3c821
============================
lmvm atikmpag
start             end                 module name
fffff880`048c5000 fffff880`0493b000   atikmpag   (deferred)             
    Image path: \SystemRoot\system32\DRIVERS\atikmpag.sys
    Image name: atikmpag.sys
    Timestamp:        Thu Aug 16 06:43:06 2012 (502C4922)
    CheckSum:         00079744
    ImageSize:        00076000
    Translations:     0000.04b0 0000.04e4 0409.04b0 0409.04e4

Update it from AMD Graphics Drivers & Software

Let us know the results.