Simply installing VirtualBox 4.3.10-93012 will make a Windows 8.1 system unbootable. You have to boot into safe mode, find some way to disable the VBox* drivers (as you can't uninstall programs from safe mode) and reboot. This is *really* severe as most users can't be expected to know how to do this. I have marked this as component network as VBoxNetFlt.sys seems to be the culprit.

I have uploaded the memory dump to http://poizan.dk/stuff/vbox-crash.dmp

The error code from the bluescreen is: SYSTEM_THREAD_EXCEPTION_NOT_HANDLED (ndis.sys)

From the event log: The computer has rebooted from a bugcheck. The bugcheck was: 0x0000007e (0xffffffffc0000005, 0xfffff80000ee9ac4, 0xffffd00020da87b8, 0xffffd00020da7fc0). A dump was saved in: C:\WINDOWS\MEMORY.DMP. Report Id: 032914-30593-01.

analyze -v output:

******************************************************************************* * * * Bugcheck Analysis * * * ******************************************************************************* SYSTEM_THREAD_EXCEPTION_NOT_HANDLED (7e) This is a very common bugcheck. Usually the exception address pinpoints the driver/function that caused the problem. Always note this address as well as the link date of the driver/image that contains this address. Arguments: Arg1: ffffffffc0000005, The exception code that was not handled Arg2: fffff80000ee9ac4, The address that the exception occurred at Arg3: ffffd00020da87b8, Exception Record Address Arg4: ffffd00020da7fc0, Context Record Address Debugging Details: ------------------ EXCEPTION_CODE: (NTSTATUS) 0xc0000005 - The instruction at 0x%08lx referenced memory at 0x%08lx. The memory could not be %s. FAULTING_IP: ndis!ndisReadMiniportMediaSpecificPortAuthStates+74 fffff800`00ee9ac4 0fb7880c020000 movzx ecx,word ptr [rax+20Ch] EXCEPTION_RECORD: ffffd00020da87b8 -- (.exr 0xffffd00020da87b8) ExceptionAddress: fffff80000ee9ac4 (ndis!ndisReadMiniportMediaSpecificPortAuthStates+0x0000000000000074) ExceptionCode: c0000005 (Access violation) ExceptionFlags: 00000000 NumberParameters: 2 Parameter[0]: 0000000000000000 Parameter[1]: 000000000000020c Attempt to read from address 000000000000020c CONTEXT: ffffd00020da7fc0 -- (.cxr 0xffffd00020da7fc0;r) rax=0000000000000000 rbx=000000000000000a rcx=ffffe00004c561a0 rdx=0000000000000466 rsi=0000000000000000 rdi=ffffe00004c561a0 rip=fffff80000ee9ac4 rsp=ffffd00020da89f0 rbp=ffffd00020da8a79 r8=ffffd00020da8a40 r9=00000000000007ff r10=ffffd00020900000 r11=0000000000000466 r12=ffffe00004c2d020 r13=ffffe00004c56200 r14=0000000000000000 r15=ffffe00004c56005 iopl=0 nv up ei ng nz ac po cy cs=0010 ss=0018 ds=002b es=002b fs=0053 gs=002b efl=00010297 ndis!ndisReadMiniportMediaSpecificPortAuthStates+0x74: fffff800`00ee9ac4 0fb7880c020000 movzx ecx,word ptr [rax+20Ch] ds:002b:00000000`0000020c=???? Last set context: rax=0000000000000000 rbx=000000000000000a rcx=ffffe00004c561a0 rdx=0000000000000466 rsi=0000000000000000 rdi=ffffe00004c561a0 rip=fffff80000ee9ac4 rsp=ffffd00020da89f0 rbp=ffffd00020da8a79 r8=ffffd00020da8a40 r9=00000000000007ff r10=ffffd00020900000 r11=0000000000000466 r12=ffffe00004c2d020 r13=ffffe00004c56200 r14=0000000000000000 r15=ffffe00004c56005 iopl=0 nv up ei ng nz ac po cy cs=0010 ss=0018 ds=002b es=002b fs=0053 gs=002b efl=00010297 ndis!ndisReadMiniportMediaSpecificPortAuthStates+0x74: fffff800`00ee9ac4 0fb7880c020000 movzx ecx,word ptr [rax+20Ch] ds:002b:00000000`0000020c=???? Resetting default scope PROCESS_NAME: System CURRENT_IRQL: 0 ERROR_CODE: (NTSTATUS) 0xc0000005 - The instruction at 0x%08lx referenced memory at 0x%08lx. The memory could not be %s. EXCEPTION_PARAMETER1: 0000000000000000 EXCEPTION_PARAMETER2: 000000000000020c READ_ADDRESS: 000000000000020c FOLLOWUP_IP: VBoxNetFlt+553a fffff800`0160553a 89442430 mov dword ptr [rsp+30h],eax BUGCHECK_STR: AV DEFAULT_BUCKET_ID: NULL_CLASS_PTR_DEREFERENCE ANALYSIS_VERSION: 6.3.9600.16384 (debuggers(dbg).130821-1623) amd64fre LAST_CONTROL_TRANSFER: from fffff80000ee99ca to fffff80000ee9ac4 STACK_TEXT: ffffd000`20da89f0 fffff800`00ee99ca : ffffe000`04c561a0 ffffe000`04c561a0 00000000`00000000 00000000`c0000001 : ndis!ndisReadMiniportMediaSpecificPortAuthStates+0x74 ffffd000`20da8ae0 fffff800`00f2151e : ffffe000`04d63b30 00000000`00000000 00000000`00000000 ffffe000`04c561a0 : ndis!ndisReadMiniportDefaultPortAuthStates+0x6e ffffd000`20da8b30 fffff800`00ee6784 : 00000000`00000000 ffffe000`04c2d020 ffffe000`005c2640 01cf4b50`ab65a489 : ndis!ndisMInitializeAdapter+0x57b2 ffffd000`20da91a0 fffff800`00ee6d3d : 00000000`00000000 00000000`00000000 ffffe000`005c2640 ffffe000`04c561a0 : ndis!ndisInitializeAdapter+0x60 ffffd000`20da91f0 fffff800`00f0a484 : ffffe000`04c561a0 ffffe000`005c2640 ffffe000`005c2640 ffffe000`04c575e8 : ndis!ndisPnPStartDevice+0x89 ffffd000`20da9240 fffff800`00f09e6b : ffffe000`005c2640 ffffe000`04c2d020 ffffe000`04c2d020 ffffd000`20da9400 : ndis!ndisIMInitializeDeviceInstance+0xe4 ffffd000`20da9320 fffff800`0160553a : ffffe000`005c2640 ffffd000`20da95a0 ffffe000`03354d38 00000000`00000000 : ndis!NdisIMInitializeDeviceInstanceEx+0xf7 ffffd000`20da9370 fffff800`016040f5 : ffffe000`005c2640 ffffe000`03354d38 ffffe000`00408e30 00000000`00000001 : VBoxNetFlt+0x553a ffffd000`20da93a0 fffff800`01607bf7 : ffffe000`00000000 ffffd000`20da9480 ffffe000`005c2640 00000000`00000000 : VBoxNetFlt+0x40f5 ffffd000`20da9430 fffff800`01607d65 : 00000000`00000000 ffffd000`20da95a0 ffffe000`005c2640 fffff800`01608a8f : VBoxNetFlt+0x7bf7 ffffd000`20da9460 fffff800`01601f46 : ffffe000`005c2640 ffffc000`015a0830 fffff800`0161ff30 ffffd000`20da95a0 : VBoxNetFlt+0x7d65 ffffd000`20da94b0 fffff800`0160207a : ffffd000`20da95e8 00000000`00000000 ffffd000`20da95a0 fffff800`0161ff30 : VBoxNetFlt+0x1f46 ffffd000`20da94f0 fffff800`0160817e : 00000000`00000000 ffffe000`03354d38 00000000`00000001 ffff6a20`0000002e : VBoxNetFlt+0x207a ffffd000`20da9570 fffff800`01602ae5 : ffffe000`03354d38 00000000`00000000 ffffd000`20da97a8 ffffe000`03354d38 : VBoxNetFlt+0x817e ffffd000`20da95e0 fffff800`00f1864d : ffffe000`00000000 ffffe000`04c292e0 00000000`00000000 ffffe000`033531a0 : VBoxNetFlt+0x2ae5 ffffd000`20da9650 fffff800`00efae42 : 00000000`00000004 ffffe000`00000000 ffffe000`04c292e0 ffffc000`0158de00 : ndis!ndisBindLegacyProtocol+0x29d ffffd000`20da97a0 fffff800`00ede9cf : 00000000`00000001 ffffd000`0000003c 00060000`21000000 00000000`00000000 : ndis!ndisRestartProtocol+0x15652 ffffd000`20da98e0 fffff800`00edd024 : ffffe000`033531a0 ffffe000`033531a0 ffffe000`03354600 ffffe000`033545e8 : ndis!Ndis::BindEngine::Iterate+0x41f ffffd000`20da9af0 fffff800`00edf88a : ffffe000`033545e8 ffffd000`20da9bd0 ffffe000`03354620 ffffd000`20da9bd0 : ndis!Ndis::BindEngine::UpdateBindings+0x64 ffffd000`20da9b20 fffff800`840b91b9 : fffff800`842b71c0 00000000`00000002 ffffe000`01151910 ffffe000`59706e50 : ndis!Ndis::BindEngine::UpdateBindingsWorkItem+0x1b ffffd000`20da9b50 fffff800`840a52e4 : 24748b48`38246c8b ffffe000`0061c880 ffffe000`0061c880 ffffe000`003a0900 : nt!ExpWorkerThread+0x2b5 ffffd000`20da9c00 fffff800`8416c2c6 : ffffd000`20a63180 ffffe000`0061c880 ffffd000`20a6f340 ad3ee8c0`000002bb : nt!PspSystemThreadStartup+0x58 ffffd000`20da9c60 00000000`00000000 : ffffd000`20daa000 ffffd000`20da4000 00000000`00000000 00000000`00000000 : nt!KiStartSystemThread+0x16 SYMBOL_STACK_INDEX: 7 SYMBOL_NAME: VBoxNetFlt+553a FOLLOWUP_NAME: MachineOwner MODULE_NAME: VBoxNetFlt IMAGE_NAME: VBoxNetFlt.sys DEBUG_FLR_IMAGE_TIMESTAMP: 5333152a STACK_COMMAND: .cxr 0xffffd00020da7fc0 ; kb FAILURE_BUCKET_ID: AV_VBoxNetFlt+553a BUCKET_ID: AV_VBoxNetFlt+553a ANALYSIS_SOURCE: KM FAILURE_ID_HASH_STRING: km:av_vboxnetflt+553a FAILURE_ID_HASH: {0077ad6c-4b15-7e9c-bbaf-3eea4932c179} Followup: MachineOwner