Random BSOD's. Most commonly error 0x000000A1.

Hi there,

Your video card driver is one of the reason of the BSODs.

1. Uninstall the ATI video card drivers including the Catalyst Center.
2. Reboot the computer and install only the driver (excluding Catalyst Center) from here.

Run system file checker to verify/repair the integrity of system files.
Full tutorial here: SFC /SCANNOW Command - System File Checker

Let us know if it helped.

The below is for information purpose only.

BugCheck Analysis:

Code:

ADDITIONAL_DEBUG_TEXT:  
You can run '.symfix; .reload' to try to fix the symbol path and load symbols.

FAULTING_MODULE: fffff80002e66000 nt

DEBUG_FLR_IMAGE_TIMESTAMP:  50d225df

CUSTOMER_CRASH_COUNT:  1

DEFAULT_BUCKET_ID:  WIN7_DRIVER_FAULT

BUGCHECK_STR:  0xA0000001

CURRENT_IRQL:  0

LAST_CONTROL_TRANSFER:  from fffff880048af11c to fffff80002edbc40

STACK_TEXT:  
fffff880`078d4768 fffff880`048af11c : 00000000`a0000001 00000000`00000005 00000000`00000000 00000000`00000000 : nt+0x75c40
fffff880`078d4770 00000000`a0000001 : 00000000`00000005 00000000`00000000 00000000`00000000 00000000`00000000 : atikmdag+0x2311c
fffff880`078d4778 00000000`00000005 : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : 0xa0000001
fffff880`078d4780 00000000`00000000 : 00000000`00000000 00000000`00000000 00000000`00000000 fffff880`078d47d0 : 0x5


STACK_COMMAND:  kb

FOLLOWUP_IP: 
atikmdag+2311c
fffff880`048af11c ??              ???

SYMBOL_STACK_INDEX:  1

SYMBOL_NAME:  atikmdag+2311c

FOLLOWUP_NAME:  MachineOwner

MODULE_NAME: atikmdag

IMAGE_NAME:  atikmdag.sys

BUCKET_ID:  WRONG_SYMBOLS

Followup: MachineOwner
---------

Also, in case you're overclocking, please STOP now.

Code:

CPUID:        "Intel(R) Core(TM) i5 CPU         760  @ 2.80GHz"
MaxSpeed:     2800
CurrentSpeed: 2809

Please run a test on your hard drive.
Download Seagate

Bug Check Analysis:

Code:

fltmgr.sys	fltmgr.sys+42ec	fffff880`010e8000	fffff880`01134000	0x0004c000	0x4ce7929c	20/11/2010 14:49:24

Take memtest. Run for 8 passes and test each stick in a know good slot for an additional 6 passes.

• RAM - Test with Memtest86+

   Note

Pay close attention to part 3 of the tutorial in order to rule out the faulty stick.

   Information

Errors are sometimes found after 8 passes.

   Tip

Do this test overnight, before going to bed.

If Memtest86+ does not find any errors with ram run Windows Memory Diagnostics for 7-8 passes following its tutorial:

• Memory Diagnostics Tool

BSOD BUGCHECK SUMMARY

Code:

Loading Dump File [C:\Users\Yusra\Downloads\joaks\SF_01-03-2013\030113-30076-01.dmp]
Built by: 7601.18044.amd64fre.win7sp1_gdr.130104-1431
Debug session time: Sat Mar  2 04:31:25.801 2013 (UTC + 6:00)
System Uptime: 0 days 0:04:40.190 
BugCheck 50, {fffffa840513f6f0, 0, fffff80002efd8da, 5}
Could not read faulting driver name
Probably caused by : ntkrnlmp.exe ( nt! ?? ::FNODOBFM::`string'+29bba )
PAGE_FAULT_IN_NONPAGED_AREA (50)
DEFAULT_BUCKET_ID:  WIN7_DRIVER_FAULT
BUGCHECK_STR:  0x50
PROCESS_NAME:  System
FAILURE_BUCKET_ID:  X64_0x50_nt!_??_::FNODOBFM::_string_+29bba
!sysinfo cpuspeed
CPUID:        "Intel(R) Core(TM) i5 CPU         760  @ 2.80GHz"
MaxSpeed:     2800
CurrentSpeed: 2809
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨``
Loading Dump File [C:\Users\Yusra\Downloads\joaks\SF_01-03-2013\030113-29905-01.dmp]
Built by: 7601.18044.amd64fre.win7sp1_gdr.130104-1431
Debug session time: Sat Mar  2 04:25:39.288 2013 (UTC + 6:00)
System Uptime: 0 days 0:38:51.615
Probably caused by : ntkrnlmp.exe ( nt! ?? ::FNODOBFM::`string'+45f7d )
MEMORY_MANAGEMENT (1a)
BUGCHECK_STR:  0x1a_5003
DEFAULT_BUCKET_ID:  WIN7_DRIVER_FAULT
PROCESS_NAME:  chrome.exe
FAILURE_BUCKET_ID:  X64_0x1a_5003_nt!_??_::FNODOBFM::_string_+45f7d
CPUID:        "Intel(R) Core(TM) i5 CPU         760  @ 2.80GHz"
MaxSpeed:     2800
CurrentSpeed: 2809
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨``
Loading Dump File [C:\Users\Yusra\Downloads\joaks\SF_01-03-2013\022813-34491-01.dmp]
Built by: 7601.18044.amd64fre.win7sp1_gdr.130104-1431
Debug session time: Fri Mar  1 09:27:58.604 2013 (UTC + 6:00)
System Uptime: 0 days 0:03:36.009
Probably caused by : ntkrnlmp.exe ( nt! ?? ::FNODOBFM::`string'+35084 )
MEMORY_MANAGEMENT (1a)
BUGCHECK_STR:  0x1a_41790
DEFAULT_BUCKET_ID:  WIN7_DRIVER_FAULT
PROCESS_NAME:  svchost.exe
FAILURE_BUCKET_ID:  X64_0x1a_41790_nt!_??_::FNODOBFM::_string_+35084
CPUID:        "Intel(R) Core(TM) i5 CPU         760  @ 2.80GHz"
MaxSpeed:     2800
CurrentSpeed: 2809
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨``
Loading Dump File [C:\Users\Yusra\Downloads\joaks\SF_01-03-2013\022813-33259-01.dmp]
Built by: 7601.18044.amd64fre.win7sp1_gdr.130104-1431
Debug session time: Fri Mar  1 06:17:45.042 2013 (UTC + 6:00)
System Uptime: 0 days 0:02:31.057
Probably caused by : Pool_Corruption ( nt!ExDeferredFreePool+257 )
SYSTEM_SERVICE_EXCEPTION (3b)
EXCEPTION_CODE: (NTSTATUS) 0xc0000005 - The instruction at 0x%08lx referenced memory at 0x%08lx. The memory could not be %s.
DEFAULT_BUCKET_ID:  WIN7_DRIVER_FAULT
BUGCHECK_STR:  0x3B
PROCESS_NAME:  lsass.exe
FAILURE_BUCKET_ID:  X64_0x3B_nt!ExDeferredFreePool+257
CPUID:        "Intel(R) Core(TM) i5 CPU         760  @ 2.80GHz"
MaxSpeed:     2800
CurrentSpeed: 2809
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨``
Loading Dump File [C:\Users\Yusra\Downloads\joaks\SF_01-03-2013\022813-33212-01.dmp]
Built by: 7601.18044.amd64fre.win7sp1_gdr.130104-1431
Debug session time: Fri Mar  1 09:22:49.146 2013 (UTC + 6:00)
System Uptime: 0 days 3:03:58.177
Probably caused by : ntkrnlmp.exe ( nt! ?? ::FNODOBFM::`string'+2984f )
MEMORY_MANAGEMENT (1a)
BUGCHECK_STR:  0x1a_5003
DEFAULT_BUCKET_ID:  WIN7_DRIVER_FAULT
PROCESS_NAME:  chrome.exe
FAILURE_BUCKET_ID:  X64_0x1a_5003_nt!_??_::FNODOBFM::_string_+2984f
CPUID:        "Intel(R) Core(TM) i5 CPU         760  @ 2.80GHz"
MaxSpeed:     2800
CurrentSpeed: 2809

Let's run driver verifier and see if it catches any misbehaving drivers:

• Driver Verifier Enable/Disable