Random BSOD for ntoskrnl.exe and others

[Matheno19]

Hello,

I am trying to resolve BSOD's on a Lenovo T420s and I have tried the following:
Chkdsk, Bios update, virus scan, memory scan - pass, hard disk test - pass, but at any moment the system crashes. I wish i knew how to read minidump files to really know what the cause is to fix. if anyone can help me out in anyway is much appreciated. Also attaching Bluescreenview log file as it is too much to fit in this thread.

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Dump File : 022613-25443-01.dmp
Crash Time : 2/26/2013 10:44:08 AM
Bug Check String : KERNEL_DATA_INPAGE_ERROR
Bug Check Code : 0x0000007a
Parameter 1 : 00000000`00000020
Parameter 2 : ffffffff`c000009d
Parameter 3 : fffffa80`05b0f558
Parameter 4 : 00000000`00000000
Caused By Driver : ntoskrnl.exe
Caused By Address : ntoskrnl.exe+75c40
File Description : NT Kernel & System
Product Name : Microsoft® Windows® Operating System
Company : Microsoft Corporation
File Version : 6.1.7601.18044 (win7sp1_gdr.130104-1431)
Processor : x64
Computer Name :
Full Path : C:\WINDOWS\Minidump\022613-25443-01.dmp
Processors Count : 4
Major Version : 15
Minor Version : 7601
Dump File Size : 262,144
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Dump File : 022213-15568-01.dmp
Crash Time : 2/22/2013 3:10:01 PM
Bug Check String : CRITICAL_OBJECT_TERMINATION
Bug Check Code : 0x000000f4
Parameter 1 : 00000000`00000003
Parameter 2 : fffffa80`05af1b30
Parameter 3 : fffffa80`05af1e10
Parameter 4 : fffff800`031d4460
Caused By Driver : ntoskrnl.exe
Caused By Address : ntoskrnl.exe+7efc0
File Description : NT Kernel & System
Product Name : Microsoft® Windows® Operating System
Company : Microsoft Corporation
File Version : 6.1.7601.18044 (win7sp1_gdr.130104-1431)
Processor : x64
Computer Name :
Full Path : C:\WINDOWS\Minidump\022213-15568-01.dmp
Processors Count : 4
Major Version : 15
Minor Version : 7601
Dump File Size : 262,144
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[Dsprague]

Please follow the Blue Screen of Death (BSOD) Posting Instructions