Yep, both of the crash dump happened while using Window media player. If you can't find the newer version for the ATI audio driver, just uninstall it and reinstall the driver.
Enable Driver Verifier as JK suggested
BUGCHECK SUMMARY:
Code:
BugCheck A, {fffff68000055c80, 0, 0, fffff800032a11e2}
Probably caused by : memory_corruption ( nt!MiAgeWorkingSet+1c2 )
Followup: MachineOwner
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PROCESS_NAME: wmplayer.exe
BugCheck 1A, {41790, fffffa800136ed50, ffff, 0}
Probably caused by : ntkrnlmp.exe ( nt! ?? ::FNODOBFM::`string'+33946 )
Followup: MachineOwner
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PROCESS_NAME: wmplayer.exe