johnbl :
copy your memory .dmp file on to a server and post a link.
On Sun 3/15/2015 10:43:52 PM GMT your computer crashed
crash dump file: C:\windows\Minidump\031515-28609-01.dmp
This was probably caused by the following module: ntoskrnl.exe (nt+0x5A440)
Bugcheck code: 0x139 (0x3, 0xFFFFF8801B25A690, 0xFFFFF8801B25A5E8, 0x0)
Error: KERNEL_SECURITY_CHECK_FAILURE
file path: C:\windows\system32\ntoskrnl.exe
product: Microsoft® Windows® Operating System
company: Microsoft Corporation
description: NT Kernel & System
Bug check description: The kernel has detected the corruption of a critical data structure.
The crash took place in the Windows kernel. Possibly this problem is caused by another driver that cannot be identified at this time.
On Sun 3/15/2015 10:43:52 PM GMT your computer crashed
crash dump file: C:\windows\memory.dmp
This was probably caused by the following module: ntkrnlmp.exe (nt!KeBugCheckEx+0x0)
Bugcheck code: 0x139 (0x3, 0xFFFFF8801B25A690, 0xFFFFF8801B25A5E8, 0x0)
Error: KERNEL_SECURITY_CHECK_FAILURE
Bug check description: The kernel has detected the corruption of a critical data structure.
The crash took place in the Windows kernel. Possibly this problem is caused by another driver that cannot be identified at this time.
On Sun 3/15/2015 10:39:53 PM GMT your computer crashed
crash dump file: C:\windows\Minidump\031515-22687-01.dmp
This was probably caused by the following module: watchdog.sys (watchdog+0x255D)
Bugcheck code: 0x119 (0x1, 0x573, 0x5F3, 0xFFFFF8A00015A0A0)
Error: VIDEO_SCHEDULER_INTERNAL_ERROR
file path: C:\windows\system32\drivers\watchdog.sys
product: Microsoft® Windows® Operating System
company: Microsoft Corporation
description: Watchdog Driver
Bug check description: This indicates that the video scheduler has detected a fatal violation.
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 that cannot be identified at this time.
On Sun 3/15/2015 6:06:37 AM GMT your computer crashed
crash dump file: C:\windows\Minidump\031515-33828-01.dmp
This was probably caused by the following module: ntoskrnl.exe (nt+0x5A440)
Bugcheck code: 0x18 (0x0, 0xFFFFF88000B68180, 0x2, 0xFFFFFFFFFFFFFFFF)
Error: REFERENCE_BY_POINTER
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 the reference count of an object is illegal for the current state of the object.
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.
The crash took place in the Windows kernel. Possibly this problem is caused by another driver that cannot be identified at this time.
On Sun 3/15/2015 5:49:27 AM GMT your computer crashed
crash dump file: C:\windows\Minidump\031515-31093-01.dmp
This was probably caused by the following module: ntoskrnl.exe (nt+0x5A440)
Bugcheck code: 0x50 (0xFFFFFFFFFFFFFF97, 0x1, 0xFFFFF80292965B80, 0x0)
Error: PAGE_FAULT_IN_NONPAGED_AREA
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 invalid system memory has been referenced.
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 that cannot be identified at this time
I used Whocrashed to get this.