a few BSOD lately

Code:

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*                                                                             *
*                        Bugcheck Analysis                                    *
*                                                                             *
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KMODE_EXCEPTION_NOT_HANDLED (1e)
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: fffff80002acd0a2, The address that the exception occurred at
Arg3: 0000000000000000, Parameter 0 of the exception
Arg4: ffffffffffffffff, Parameter 1 of the exception

Debugging Details:
------------------


EXCEPTION_CODE: (NTSTATUS) 0xc0000005 - The instruction at 0x%08lx referenced memory at 0x%08lx. The memory could not be %s.

FAULTING_IP: 
nt!KxWaitForLockOwnerShip+12
fffff800`02acd0a2 48890a          mov     qword ptr [rdx],rcx

EXCEPTION_PARAMETER1:  0000000000000000

EXCEPTION_PARAMETER2:  ffffffffffffffff

READ_ADDRESS: GetPointerFromAddress: unable to read from fffff80002cc40e0
 ffffffffffffffff 

ERROR_CODE: (NTSTATUS) 0xc0000005 - The instruction at 0x%08lx referenced memory at 0x%08lx. The memory could not be %s.

BUGCHECK_STR:  0x1E_c0000005

CUSTOMER_CRASH_COUNT:  1

DEFAULT_BUCKET_ID:  VISTA_DRIVER_FAULT

PROCESS_NAME:  Steam.exe

CURRENT_IRQL:  2

EXCEPTION_RECORD:  fffff8800b544988 -- (.exr 0xfffff8800b544988)
ExceptionAddress: fffff80002acd0a2 (nt!KxWaitForLockOwnerShip+0x0000000000000012)
   ExceptionCode: c0000005 (Access violation)
  ExceptionFlags: 00000000
NumberParameters: 2
   Parameter[0]: 0000000000000000
   Parameter[1]: ffffffffffffffff
Attempt to read from address ffffffffffffffff

TRAP_FRAME:  fffff8800b544a30 -- (.trap 0xfffff8800b544a30)
NOTE: The trap frame does not contain all registers.
Some register values may be zeroed or incorrect.
rax=0000000000000001 rbx=0000000000000000 rcx=fffff8800b544c68
rdx=9800000000000000 rsi=0000000000000000 rdi=0000000000000000
rip=fffff80002acd0a2 rsp=fffff8800b544bc0 rbp=fffff8800b544c40
 r8=fffff80002c06e80  r9=0000000000000000 r10=fffff80002cc6840
r11=0000058000000000 r12=0000000000000000 r13=0000000000000000
r14=0000000000000000 r15=0000000000000000
iopl=0         nv up ei ng nz na po nc
nt!KxWaitForLockOwnerShip+0x12:
fffff800`02acd0a2 48890a          mov     qword ptr [rdx],rcx ds:0202:98000000`00000000=????????????????
Resetting default scope

LAST_CONTROL_TRANSFER:  from fffff80002ac6a39 to fffff80002a8c740

STACK_TEXT:  
fffff880`0b5441b8 fffff800`02ac6a39 : 00000000`0000001e ffffffff`c0000005 fffff800`02acd0a2 00000000`00000000 : nt!KeBugCheckEx
fffff880`0b5441c0 fffff800`02a8bd82 : fffff880`0b544988 fffffa80`00363f30 fffff880`0b544a30 00000000`00000001 : nt!KiDispatchException+0x1b9
fffff880`0b544850 fffff800`02a8a68a : fffff880`0b544c90 fffff6fc`806100c8 fffffa80`0990cb60 00000000`00000000 : nt!KiExceptionDispatch+0xc2
fffff880`0b544a30 fffff800`02acd0a2 : 00000000`00000000 00000000`00000001 fffffa80`048d8148 00000000`00000001 : nt!KiGeneralProtectionFault+0x10a
fffff880`0b544bc0 fffff800`02aa5314 : fffffa80`00363f30 00000000`00000000 fffff880`0b544c40 fffffa80`048d8040 : nt!KxWaitForLockOwnerShip+0x12
fffff880`0b544bf0 fffff800`02abe0bf : 00000000`00000000 fffff680`00074a08 00000000`00000000 ff008c00`6d004d00 : nt!MiInsertPageInFreeOrZeroedList+0x4e4
fffff880`0b544cf0 fffff800`02abd381 : 00000000`00000000 fffff680`00074ff8 fffffa80`0995f9e0 fffffa80`0990cb60 : nt!MiDeletePteRun+0x49f
fffff880`0b544ea0 fffff800`02ace0da : 00000000`00000000 00000000`0ebf9fff fffffa80`00000000 fffffa80`0995f9e0 : nt!MiDeleteVirtualAddresses+0x408
fffff880`0b545060 fffff800`02a8b993 : ffffffff`ffffffff fffff880`0b545320 fffff880`0b545388 00000000`00008000 : nt!NtFreeVirtualMemory+0x5ca
fffff880`0b545150 00000000`00000000 : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : nt!KiSystemServiceCopyEnd+0x13


STACK_COMMAND:  kb

FOLLOWUP_IP: 
nt!KxWaitForLockOwnerShip+12
fffff800`02acd0a2 48890a          mov     qword ptr [rdx],rcx

SYMBOL_STACK_INDEX:  4

SYMBOL_NAME:  nt!KxWaitForLockOwnerShip+12

FOLLOWUP_NAME:  MachineOwner

MODULE_NAME: nt

IMAGE_NAME:  ntkrnlmp.exe

DEBUG_FLR_IMAGE_TIMESTAMP:  4c1c44a9

FAILURE_BUCKET_ID:  X64_0x1E_c0000005_nt!KxWaitForLockOwnerShip+12

BUCKET_ID:  X64_0x1E_c0000005_nt!KxWaitForLockOwnerShip+12

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

Steam is faulting application uninstall it, you can try reinstalling it if the problem is still here then run Memtest86 to check your RAM: Memtest86.com - Memory Diagnostic

Code:

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*                                                                             *
*                        Bugcheck Analysis                                    *
*                                                                             *
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ATTEMPTED_EXECUTE_OF_NOEXECUTE_MEMORY (fc)
An attempt was made to execute non-executable memory.  The guilty driver
is on the stack trace (and is typically the current instruction pointer).
When possible, the guilty driver's name (Unicode string) is printed on
the bugcheck screen and saved in KiBugCheckDriver.
Arguments:
Arg1: fffff8800837f9d0, Virtual address for the attempted execute.
Arg2: 8000000145796963, PTE contents.
Arg3: fffff8800837f650, (reserved)
Arg4: 0000000000000002, (reserved)

Debugging Details:
------------------


CUSTOMER_CRASH_COUNT:  1

DEFAULT_BUCKET_ID:  VISTA_DRIVER_FAULT

BUGCHECK_STR:  0xFC

PROCESS_NAME:  SteamService.e

CURRENT_IRQL:  0

TRAP_FRAME:  fffff8800837f650 -- (.trap 0xfffff8800837f650)
NOTE: The trap frame does not contain all registers.
Some register values may be zeroed or incorrect.
rax=fffffa8005a26970 rbx=0000000000000000 rcx=fffffa8005a26920
rdx=fffffa8009b23b80 rsi=0000000000000000 rdi=0000000000000000
rip=fffff8800837f9d0 rsp=fffff8800837f7e8 rbp=fffffa8009b23b80
 r8=fffffa80048f1570  r9=0000000000000001 r10=fffffa8006c84a70
r11=fffff8800837f798 r12=0000000000000000 r13=0000000000000000
r14=0000000000000000 r15=0000000000000000
iopl=0         nv up ei ng nz na po nc
fffff880`0837f9d0 1f              ???
Resetting default scope

LAST_CONTROL_TRANSFER:  from fffff80002b01bcf to fffff80002a81740

STACK_TEXT:  
fffff880`0837f4e8 fffff800`02b01bcf : 00000000`000000fc fffff880`0837f9d0 80000001`45796963 fffff880`0837f650 : nt!KeBugCheckEx
fffff880`0837f4f0 fffff800`02a7f82e : 00000000`00000008 fffff8a0`03222cc0 00000000`00000000 fffff8a0`06d529c0 : nt! ?? ::FNODOBFM::`string'+0x42497
fffff880`0837f650 fffff880`0837f9d0 : fffff880`0837f808 fffff880`0837f868 fffff880`060800df fffff8a0`03222cc0 : nt!KiPageFault+0x16e
fffff880`0837f7e8 fffff880`0837f808 : fffff880`0837f868 fffff880`060800df fffff8a0`03222cc0 fffff8a0`06d529c0 : 0xfffff880`0837f9d0
fffff880`0837f7f0 fffff880`0837f868 : fffff880`060800df fffff8a0`03222cc0 fffff8a0`06d529c0 fffffa80`06c84a70 : 0xfffff880`0837f808
fffff880`0837f7f8 fffff880`060800df : fffff8a0`03222cc0 fffff8a0`06d529c0 fffffa80`06c84a70 0101000e`48bbaecd : 0xfffff880`0837f868
fffff880`0837f800 fffff8a0`03222cc0 : fffff8a0`06d529c0 fffffa80`06c84a70 0101000e`48bbaecd 00000000`eeee1234 : nvlddmkm+0x1bb0df
fffff880`0837f808 fffff8a0`06d529c0 : fffffa80`06c84a70 0101000e`48bbaecd 00000000`eeee1234 00000000`00000000 : 0xfffff8a0`03222cc0
fffff880`0837f810 fffffa80`06c84a70 : 0101000e`48bbaecd 00000000`eeee1234 00000000`00000000 fffff800`02c33300 : 0xfffff8a0`06d529c0
fffff880`0837f818 0101000e`48bbaecd : 00000000`eeee1234 00000000`00000000 fffff800`02c33300 00000000`00000001 : 0xfffffa80`06c84a70
fffff880`0837f820 00000000`eeee1234 : 00000000`00000000 fffff800`02c33300 00000000`00000001 00000000`00000000 : 0x101000e`48bbaecd
fffff880`0837f828 00000000`00000000 : fffff800`02c33300 00000000`00000001 00000000`00000000 00000000`00000000 : 0xeeee1234


STACK_COMMAND:  kb

FOLLOWUP_IP: 
nvlddmkm+1bb0df
fffff880`060800df ??              ???

SYMBOL_STACK_INDEX:  6

SYMBOL_NAME:  nvlddmkm+1bb0df

FOLLOWUP_NAME:  MachineOwner

MODULE_NAME: nvlddmkm

IMAGE_NAME:  nvlddmkm.sys

DEBUG_FLR_IMAGE_TIMESTAMP:  4bb7d7fd

FAILURE_BUCKET_ID:  X64_0xFC_nvlddmkm+1bb0df

BUCKET_ID:  X64_0xFC_nvlddmkm+1bb0df

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

Same thing "SteamService.e" is the faulting application, just follow the instructions above and see how you go.

Thanks for the rep, so your problem is gone now and thing a are all good.