Windows 7: Win 7 professional crashes randomly on older PC

On Sat 1.1.2011 23:23:14 GMT your computer crashed
crash dump file: C:\Windows\Minidump\010211-16921-01.dmp
This was probably caused by the following module: aswfsblk.sys (aswFsBlk+0x15B4) 
Bugcheck code: 0x19 (0x3, 0xFFFFFFFF8462F900, 0xFFFFFFFF8462F900, 0x810600)
Error: BAD_POOL_HEADER
file path: C:\Windows\system32\drivers\aswfsblk.sys
product: avast! Antivirus System
company: AVAST Software
description: avast! File System Access Blocking Driver
Bug check description: This indicates that a pool header is corrupt.
This appears to be a typical software driver bug and is not likely to be caused by a hardware problem. This might be a case of memory corruption. More often memory corruption happens because of software errors in buggy drivers, not because of faulty RAM modules. 
A third party driver was identified as the probable root cause of this system error. It is suggested you look for an update for the following driver: aswfsblk.sys (avast! File System Access Blocking Driver, AVAST Software). 
Google query: aswfsblk.sys AVAST Software BAD_POOL_HEADER




On Fri 31.12.2010 21:28:52 GMT your computer crashed
crash dump file: C:\Windows\Minidump\123110-14671-01.dmp
This was probably caused by the following module: ntoskrnl.exe (nt+0x206060) 
Bugcheck code: 0x10000050 (0xFFFFFFFFFA7585A5, 0x1, 0xFFFFFFFF82A0C060, 0x2)
Error: CUSTOM_ERROR
file path: C:\Windows\system32\ntoskrnl.exe
product: Microsoft® Windows® Operating System
company: Microsoft Corporation
description: NT Kernel & System
The crash took place in the Windows kernel. Possibly this problem is caused by another driver which cannot be identified at this time. 


On Thu 30.12.2010 0:54:52 GMT your computer crashed
crash dump file: C:\Windows\Minidump\123010-16328-01.dmp
This was probably caused by the following module: win32k.sys (win32k+0xCCDB6) 
Bugcheck code: 0x1000008E (0xFFFFFFFFC000001D, 0xFFFFFFFF91D5CDB6, 0xFFFFFFFF9F894C18, 0x0)
Error: KERNEL_MODE_EXCEPTION_NOT_HANDLED_M
file path: C:\Windows\system32\win32k.sys
product: Microsoft® Windows® Operating System
company: Microsoft Corporation
description: Multi-User Win32 Driver
Bug check description: This indicates that a kernel-mode program generated an exception which the error handler did not catch.
This appears to be a typical software driver bug and is not likely to be caused by a hardware problem. 
The crash took place in a standard Microsoft module. Your system configuration may be incorrect. Possibly this problem is caused by another driver on your system which cannot be identified at this time. 


On Wed 29.12.2010 8:34:23 GMT your computer crashed
crash dump file: C:\Windows\Minidump\122910-15046-01.dmp
This was probably caused by the following module: aswsp.sys (aswSP+0x15B01) 
Bugcheck code: 0x100000BE (0xFFFFFFFF97795000, 0x3BCA2802, 0xFFFFFFFF9A566AC4, 0xE)
Error: CUSTOM_ERROR
file path: C:\Windows\system32\drivers\aswsp.sys
product: avast! Antivirus System
company: AVAST Software
description: avast! self protection module
A third party driver was identified as the probable root cause of this system error. It is suggested you look for an update for the following driver: aswsp.sys (avast! self protection module, AVAST Software). 
Google query: aswsp.sys AVAST Software CUSTOM_ERROR




On Tue 28.12.2010 20:46:14 GMT your computer crashed
crash dump file: C:\Windows\Minidump\122810-14765-01.dmp
This was probably caused by the following module: ntoskrnl.exe (nt+0x206064) 
Bugcheck code: 0x10000050 (0xFFFFFFFFFFE4E112, 0x0, 0xFFFFFFFF82A0E064, 0x0)
Error: CUSTOM_ERROR
file path: C:\Windows\system32\ntoskrnl.exe
product: Microsoft® Windows® Operating System
company: Microsoft Corporation
description: NT Kernel & System
The crash took place in the Windows kernel. Possibly this problem is caused by another driver which cannot be identified at this time. 


On Tue 28.12.2010 19:11:27 GMT your computer crashed
crash dump file: C:\Windows\Minidump\122810-17031-01.dmp
This was probably caused by the following module: ntoskrnl.exe (nt+0x3579A) 
Bugcheck code: 0x10000050 (0xFFFFFFFFF5B5DC6C, 0x0, 0xFFFFFFFFF5B5DC6C, 0x2)
Error: CUSTOM_ERROR
file path: C:\Windows\system32\ntoskrnl.exe
product: Microsoft® Windows® Operating System
company: Microsoft Corporation
description: NT Kernel & System
The crash took place in the Windows kernel. Possibly this problem is caused by another driver which cannot be identified at this time. 


On Tue 28.12.2010 14:43:47 GMT your computer crashed
crash dump file: C:\Windows\Minidump\122810-16093-01.dmp
This was probably caused by the following module: ntoskrnl.exe (nt+0x206057) 
Bugcheck code: 0x1000008E (0xFFFFFFFFC0000005, 0xFFFFFFFF82A0C057, 0xFFFFFFFF9A353C58, 0x0)
Error: KERNEL_MODE_EXCEPTION_NOT_HANDLED_M
file path: C:\Windows\system32\ntoskrnl.exe
product: Microsoft® Windows® Operating System
company: Microsoft Corporation
description: NT Kernel & System
Bug check description: This indicates that a kernel-mode program generated an exception which the error handler did not catch.
This appears to be a typical software driver bug and is not likely to be caused by a hardware problem. 
The crash took place in the Windows kernel. Possibly this problem is caused by another driver which cannot be identified at this time. 


On Mon 27.12.2010 22:13:09 GMT your computer crashed
crash dump file: C:\Windows\Minidump\122710-15171-01.dmp
This was probably caused by the following module: ntoskrnl.exe (nt+0x206057) 
Bugcheck code: 0x1000008E (0xFFFFFFFFC0000005, 0xFFFFFFFF82A50057, 0xFFFFFFFF8C658C58, 0x0)
Error: KERNEL_MODE_EXCEPTION_NOT_HANDLED_M
file path: C:\Windows\system32\ntoskrnl.exe
product: Microsoft® Windows® Operating System
company: Microsoft Corporation
description: NT Kernel & System
Bug check description: This indicates that a kernel-mode program generated an exception which the error handler did not catch.
This appears to be a typical software driver bug and is not likely to be caused by a hardware problem. 
The crash took place in the Windows kernel. Possibly this problem is caused by another driver which cannot be identified at this time. 


On Mon 27.12.2010 21:37:04 GMT your computer crashed
crash dump file: C:\Windows\Minidump\122710-16609-01.dmp
This was probably caused by the following module: ntoskrnl.exe (nt+0x206057) 
Bugcheck code: 0x1000008E (0xFFFFFFFFC0000005, 0xFFFFFFFF82A1E057, 0xFFFFFFFF96833C58, 0x0)
Error: KERNEL_MODE_EXCEPTION_NOT_HANDLED_M
file path: C:\Windows\system32\ntoskrnl.exe
product: Microsoft® Windows® Operating System
company: Microsoft Corporation
description: NT Kernel & System
Bug check description: This indicates that a kernel-mode program generated an exception which the error handler did not catch.
This appears to be a typical software driver bug and is not likely to be caused by a hardware problem. 
The crash took place in the Windows kernel. Possibly this problem is caused by another driver which cannot be identified at this time.