Windows 7 BSOD'S

[MRF71]

Hello,
I've been having some random crashes as of late and not sure why, any help would be appreciated
I do know it's not malware related because i've done plenty of scans and i'm very well protected from that.

http://speccy.piriform.com/results/aUgk77BN15ca8LC23Qn1zN2

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Dump File : 032012-21013-01.dmp
Crash Time : 3/20/2012 11:12:14 PM
Bug Check String : PFN_LIST_CORRUPT
Bug Check Code : 0x0000004e
Parameter 1 : 0x00000007
Parameter 2 : 0x000bb562
Parameter 3 : 0x00000001
Parameter 4 : 0x00000000
Caused By Driver : ntoskrnl.exe
Caused By Address : ntoskrnl.exe+92f20
File Description : NT Kernel & System
Product Name : Microsoft® Windows® Operating System
Company : Microsoft Corporation
File Version : 6.1.7601.17727 (win7sp1_gdr.111118-2330)
Processor : 32-bit
Crash Address : ntoskrnl.exe+92f20
Stack Address 1 : ntoskrnl.exe+6bb85
Stack Address 2 : ntoskrnl.exe+78ad8
Stack Address 3 : tdx.sys+588d
Computer Name :
Full Path : C:\Windows\Minidump\032012-21013-01.dmp
Processors Count : 2
Major Version : 15
Minor Version : 7601
Dump File Size : 162,046
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Dump File : 031612-18579-01.dmp
Crash Time : 3/16/2012 2:28:53 PM
Bug Check String : MULTIPLE_IRP_COMPLETE_REQUESTS
Bug Check Code : 0x00000044
Parameter 1 : 0x85f335f8
Parameter 2 : 0x00000eae
Parameter 3 : 0x00000000
Parameter 4 : 0x00000000
Caused By Driver : tdx.sys
Caused By Address : tdx.sys+f38a
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 : 32-bit
Crash Address : ntoskrnl.exe+78cbd
Stack Address 1 : tdx.sys+588d
Stack Address 2 : tcpip.sys+5b592
Stack Address 3 : tcpip.sys+85818
Computer Name :
Full Path : C:\Windows\Minidump\031612-18579-01.dmp
Processors Count : 2
Major Version : 15
Minor Version : 7601
Dump File Size : 161,886
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Dump File : 030912-18345-01.dmp
Crash Time : 3/9/2012 3:56:18 AM
Bug Check String : KERNEL_MODE_EXCEPTION_NOT_HANDLED
Bug Check Code : 0x1000008e
Parameter 1 : 0xc0000005
Parameter 2 : 0x8b1ecc82
Parameter 3 : 0xa5ae8920
Parameter 4 : 0x00000000
Caused By Driver : tdx.sys
Caused By Address : tdx.sys+4c82
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 : 32-bit
Crash Address : tdx.sys+4c82
Stack Address 1 : tdx.sys+c009
Stack Address 2 : ntoskrnl.exe+3758e
Stack Address 3 : cmdhlp.sys+304c
Computer Name :
Full Path : C:\Windows\Minidump\030912-18345-01.dmp
Processors Count : 2
Major Version : 15
Minor Version : 7601
Dump File Size : 161,854
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Dump File : 030112-18517-01.dmp
Crash Time : 3/2/2012 12:53:17 AM
Bug Check String : PFN_LIST_CORRUPT
Bug Check Code : 0x0000004e
Parameter 1 : 0x00000007
Parameter 2 : 0x000bbd78
Parameter 3 : 0x00000001
Parameter 4 : 0x00000000
Caused By Driver : ntoskrnl.exe
Caused By Address : ntoskrnl.exe+92f30
File Description : NT Kernel & System
Product Name : Microsoft® Windows® Operating System
Company : Microsoft Corporation
File Version : 6.1.7601.17727 (win7sp1_gdr.111118-2330)
Processor : 32-bit
Crash Address : ntoskrnl.exe+92f30
Stack Address 1 : ntoskrnl.exe+6bb85
Stack Address 2 : ntoskrnl.exe+78ab8
Stack Address 3 : tdx.sys+588d
Computer Name :
Full Path : C:\Windows\Minidump\030112-18517-01.dmp
Processors Count : 2
Major Version : 15
Minor Version : 7601
Dump File Size : 161,854
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