D'ou peuvent venir ses BSOD?

Bonjour,
crash dump file: C:\Windows\Minidump\121611-46031-01.dmp
This was probably caused by the following module: ntoskrnl.exe (nt+0x705C0)
Bugcheck code: 0xA (0x0, 0x2, 0x0, 0xFFFFF800033192BE)
Error: IRQL_NOT_LESS_OR_EQUAL
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 Microsoft Windows or a kernel-mode driver accessed paged memory at DISPATCH_LEVEL or above.
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.

crash dump file: C:\Windows\memory.dmp
This was probably caused by the following module: ndis.sys (ndis!NdisAcquireReadWriteLock+0xC1)
Bugcheck code: 0xA (0x0, 0x2, 0x0, 0xFFFFF800033192BE)
Error: IRQL_NOT_LESS_OR_EQUAL
file path: C:\Windows\system32\drivers\ndis.sys
product: Système d'exploitation Microsoft® Windows®
company: Microsoft Corporation
description: Pilote NDIS 6.20
Bug check description: This indicates that Microsoft Windows or a kernel-mode driver accessed paged memory at DISPATCH_LEVEL or above.
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.

crash dump file: C:\Windows\Minidump\121611-60250-01.dmp
This was probably caused by the following module: ntoskrnl.exe (nt+0x705C0)
Bugcheck code: 0x50 (0xFFFFFA8019392018, 0x1, 0xFFFFF88003CF3756, 0x2)
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 which cannot be identified at this time.

crash dump file: C:\Windows\Minidump\121511-45187-01.dmp
This was probably caused by the following module: ntoskrnl.exe (nt+0x705C0)
Bugcheck code: 0x1A (0x41790, 0xFFFFFA80024719A0, 0xFFFF, 0x0)
Error: MEMORY_MANAGEMENT
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 severe memory management error occurred.
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 which cannot be identified at this time.