BSOD on windows 7 - different reasons

Hey Guys,
i have a user at work that is experiencing BSOD couple of time for the last month.
i got the last 5 dump files, each one is for different reason so i'm not sure whats exactly is the problem.
i cleared the page file on his virtual memory.
but it seems has he some more issues other than that.
here is the dump files:
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Dump File : 081314-12620-01.dmp
Crash Time : 8/13/2014 8:53:21 AM
Bug Check String : DRIVER_CORRUPTED_EXPOOL
Bug Check Code : 0x000000c5
Parameter 1 : 00000000`00000000
Parameter 2 : 00000000`00000002
Parameter 3 : 00000000`00000000
Parameter 4 : fffff800`02ff7aa9
Caused By Driver : ntoskrnl.exe
Caused By Address : ntoskrnl.exe+75bc0
File Description : NT Kernel & System
Product Name : Microsoft® Windows® Operating System
Company : Microsoft Corporation
File Version : 6.1.7601.18409 (win7sp1_gdr.140303-2144)
Processor : x64
Crash Address : ntoskrnl.exe+75bc0
Stack Address 1 :
Stack Address 2 :
Stack Address 3 :
Computer Name :
Full Path : C:\WINDOWS\Minidump\081314-12620-01.dmp
Processors Count : 4
Major Version : 15
Minor Version : 7601
Dump File Size : 262,144
Dump File Time : 8/13/2014 8:54:31 AM
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Dump File : 072214-9859-01.dmp
Crash Time : 7/22/2014 12:49:31 PM
Bug Check String : SYSTEM_SERVICE_EXCEPTION
Bug Check Code : 0x0000003b
Parameter 1 : 00000000`c0000005
Parameter 2 : fffff880`01614672
Parameter 3 : fffff880`0af32620
Parameter 4 : 00000000`00000000
Caused By Driver : ndis.sys
Caused By Address : ndis.sys+4808b
File Description : NDIS 6.20 driver
Product Name : Microsoft® Windows® Operating System
Company : Microsoft Corporation
File Version : 6.1.7600.16385 (win7_rtm.090713-1255)
Processor : x64
Crash Address : ntoskrnl.exe+75bc0
Stack Address 1 :
Stack Address 2 :
Stack Address 3 :
Computer Name :
Full Path : C:\WINDOWS\Minidump\072214-9859-01.dmp
Processors Count : 4
Major Version : 15
Minor Version : 7601
Dump File Size : 266,288
Dump File Time : 7/22/2014 12:50:06 PM
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Dump File : 071814-10951-01.dmp
Crash Time : 7/18/2014 12:32:11 AM
Bug Check String : SYSTEM_SERVICE_EXCEPTION
Bug Check Code : 0x0000003b
Parameter 1 : 00000000`c0000005
Parameter 2 : fffff880`013cf672
Parameter 3 : fffff880`02b159b0
Parameter 4 : 00000000`00000000
Caused By Driver : tdx.sys
Caused By Address : tdx.sys+3672
File Description : TDI Translation Driver
Product Name : Microsoft® Windows® Operating System
Company : Microsoft Corporation
File Version : 6.1.7601.17514 (win7sp1_rtm.101119-1850)
Processor : x64
Crash Address : ntoskrnl.exe+75bc0
Stack Address 1 :
Stack Address 2 :
Stack Address 3 :
Computer Name :
Full Path : C:\WINDOWS\Minidump\071814-10951-01.dmp
Processors Count : 4
Major Version : 15
Minor Version : 7601
Dump File Size : 262,144
Dump File Time : 7/18/2014 12:34:40 AM
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Dump File : 062614-10452-01.dmp
Crash Time : 6/26/2014 1:55:06 PM
Bug Check String : SYSTEM_THREAD_EXCEPTION_NOT_HANDLED
Bug Check Code : 0x1000007e
Parameter 1 : ffffffff`c0000005
Parameter 2 : fffff800`02e84eb0
Parameter 3 : fffff880`0a803698
Parameter 4 : fffff880`0a802ef0
Caused By Driver : ndis.sys
Caused By Address : ndis.sys+2191
File Description : NDIS 6.20 driver
Product Name : Microsoft® Windows® Operating System
Company : Microsoft Corporation
File Version : 6.1.7600.16385 (win7_rtm.090713-1255)
Processor : x64
Crash Address : ntoskrnl.exe+7eeb0
Stack Address 1 :
Stack Address 2 :
Stack Address 3 :
Computer Name :
Full Path : C:\WINDOWS\Minidump\062614-10452-01.dmp
Processors Count : 4
Major Version : 15
Minor Version : 7601
Dump File Size : 262,144
Dump File Time : 6/26/2014 1:55:45 PM
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Dump File : 062514-8876-01.dmp
Crash Time : 6/25/2014 7:26:07 PM
Bug Check String : DRIVER_POWER_STATE_FAILURE
Bug Check Code : 0x1000009f
Parameter 1 : 00000000`00000004
Parameter 2 : 00000000`00000258
Parameter 3 : fffffa80`0398b040
Parameter 4 : fffff800`00b9c3d0
Caused By Driver : ntoskrnl.exe
Caused By Address : ntoskrnl.exe+78a8a
File Description : NT Kernel & System
Product Name : Microsoft® Windows® Operating System
Company : Microsoft Corporation
File Version : 6.1.7601.18409 (win7sp1_gdr.140303-2144)
Processor : x64
Crash Address : ntoskrnl.exe+78a8a
Stack Address 1 :
Stack Address 2 :
Stack Address 3 :
Computer Name :
Full Path : C:\WINDOWS\Minidump\062514-8876-01.dmp
Processors Count : 4
Major Version : 15
Minor Version : 7601
Dump File Size : 468,392
Dump File Time : 6/25/2014 7:27:11 PM
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appreciate the help on this one.