BSOD-Power Failure state

I have windows 8 installed on my home computer. The computer keeps shutting down on it's own and saying "Driver Power State Failure". Can someone look at my BSOD Minidump files and give me an idea of what could be causing this problem. I have tried to save the minidump files into a zip file, but it brings up an error not allowing me to do this. Hopefully the text file from Blue Screen view is enough to figure this out. Thanks.

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Dump File : 021413-31262-01.dmp
Crash Time : 2/14/2013 11:00:19 AM
Bug Check String : DRIVER_POWER_STATE_FAILURE
Bug Check Code : 0x0000009f
Parameter 1 : 00000000`00000003
Parameter 2 : fffffa80`1c00e600
Parameter 3 : fffff800`49f58920
Parameter 4 : fffffa80`1b38fa00
Caused By Driver : atapi.sys
Caused By Address : atapi.sys+3474
File Description :
Product Name :
Company :
File Version :
Processor : x64
Crash Address : ntoskrnl.exe+7a040
Stack Address 1 :
Stack Address 2 :
Stack Address 3 :
Computer Name :
Full Path : C:\Windows\Minidump\021413-31262-01.dmp
Processors Count : 8
Major Version : 15
Minor Version : 9200
Dump File Size : 905,408

Dump File : 021313-22042-01.dmp
Crash Time : 2/13/2013 8:27:48 PM
Bug Check String : DRIVER_POWER_STATE_FAILURE
Bug Check Code : 0x0000009f
Parameter 1 : 00000000`00000003
Parameter 2 : fffffa80`09a0d060
Parameter 3 : fffff803`f9af1920
Parameter 4 : fffffa80`09afb010
Caused By Driver : ntoskrnl.exe
Caused By Address : ntoskrnl.exe+7a040
File Description :
Product Name :
Company :
File Version :
Processor : x64
Crash Address : ntoskrnl.exe+7a040
Stack Address 1 :
Stack Address 2 :
Stack Address 3 :
Computer Name :
Full Path : C:\Windows\Minidump\021313-22042-01.dmp
Processors Count : 8
Major Version : 15
Minor Version : 9200
Dump File Size : 859,208

Dump File : 021313-21153-01.dmp
Crash Time : 2/13/2013 12:15:23 PM
Bug Check String : DRIVER_POWER_STATE_FAILURE
Bug Check Code : 0x0000009f
Parameter 1 : 00000000`00000003
Parameter 2 : fffffa80`057ce060
Parameter 3 : fffff800`88bf8920
Parameter 4 : fffffa80`0a9e47d0
Caused By Driver : ntoskrnl.exe
Caused By Address : ntoskrnl.exe+7a040
File Description :
Product Name :
Company :
File Version :
Processor : x64
Crash Address : ntoskrnl.exe+7a040
Stack Address 1 :
Stack Address 2 :
Stack Address 3 :
Computer Name :
Full Path : C:\Windows\Minidump\021313-21153-01.dmp
Processors Count : 8
Major Version : 15
Minor Version : 9200
Dump File Size : 861,376