Windows 7 0x0000003b BSOD Random Crashing

.....
Unable to load image [U][B]nvlddmkm.sys[/B][/U], Win32 error 0n2
*** WARNING: Unable to verify timestamp for [B][U]nvlddmkm.sys[/U][/B]
*** ERROR: Module load completed but symbols could not be loaded for [B][U]nvlddmkm.sys[/U][/B]
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*                        Bugcheck Analysis                                    *
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Use !analyze -v to get detailed debugging information.
BugCheck 1000007E, {ffffffffc0000005, fffff8800f469ec0, fffff880031f6858, fffff880031f60b0}
[B][U]Probably caused by : nvlddmkm.sys[/U][/B] ( nvlddmkm+207ec0 )
Followup: MachineOwner
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1: kd> !analyze -v
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*                        Bugcheck Analysis                                    *
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[U][B]SYSTEM_THREAD_EXCEPTION_NOT_HANDLED_M (1000007e)
This is a very common bugcheck.  Usually the exception address pinpoints
the driver/function that caused the problem.[/B][/U]  Always note this address
as well as the link date of the driver/image that contains this address.
Some common problems are exception code 0x80000003.  This means a hard
coded breakpoint or assertion was hit, but this system was booted
/NODEBUG.  This is not supposed to happen as developers should never have
hardcoded breakpoints in retail code, but ...
If this happens, make sure a debugger gets connected, and the
system is booted /DEBUG.  This will let us see why this breakpoint is
happening.
Arguments:
Arg1: ffffffffc0000005, The exception code that was not handled
Arg2: fffff8800f469ec0, The address that the exception occurred at
Arg3: fffff880031f6858, Exception Record Address
Arg4: fffff880031f60b0, 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: 
nvlddmkm+207ec0
fffff880`0f469ec0 0000            add     byte ptr [rax],al
EXCEPTION_RECORD:  fffff880031f6858 -- (.exr 0xfffff880031f6858)
[U][B]ExceptionAddress: fffff8800f469ec0 (nvlddmkm+0x0000000000207ec0)[/B][/U]
   ExceptionCode: c0000005 (Access violation)
  ExceptionFlags: 00000000
NumberParameters: 2
   Parameter[0]: 0000000000000001
   Parameter[1]: 0000000000000000
Attempt to write to address 0000000000000000
CONTEXT:  fffff880031f60b0 -- (.cxr 0xfffff880031f60b0)
rax=0000000000000000 rbx=0000000000000000 rcx=0000000000000000
rdx=0000000000000001 rsi=0000000000000000 rdi=0000000000000000
rip=fffff8800f469ec0 rsp=fffff880031f6a98 rbp=0000000000000001
 r8=0000000000000000  r9=0000000000000000 r10=fffffa800701f680
r11=0000017664370010 r12=fffffa80087ce000 r13=0000000000000000
r14=0000000000000000 r15=0000000000000000
iopl=0         nv up ei ng nz na po nc
cs=0010  ss=0018  ds=002b  es=002b  fs=0053  gs=002b             efl=00010286
nvlddmkm+0x207ec0:
fffff880`0f469ec0 0000            add     byte ptr [rax],al ds:002b:00000000`00000000=??
Resetting default scope
CUSTOMER_CRASH_COUNT:  1
DEFAULT_BUCKET_ID:  NULL_DEREFERENCE
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:  0000000000000001
EXCEPTION_PARAMETER2:  0000000000000000
WRITE_ADDRESS: GetPointerFromAddress: unable to read from fffff800038b1100
 0000000000000000 
FOLLOWUP_IP: 
nvlddmkm+207ec0
fffff880`0f469ec0 0000            add     byte ptr [rax],al
BUGCHECK_STR:  0x7E
LAST_CONTROL_TRANSFER:  from fffff8800f46a6cd to fffff8800f469ec0
STACK_TEXT:  
fffff880`031f6a98 fffff880`0f46a6cd : 00000000`00000000 00000000`00000000 00000000`00000000 fffff880`0f4477a3 : nvlddmkm+0x207ec0
fffff880`031f6aa0 00000000`00000000 : 00000000`00000000 00000000`00000000 fffff880`0f4477a3 00000000`00000000 : nvlddmkm+0x2086cd
SYMBOL_STACK_INDEX:  0
SYMBOL_NAME:  nvlddmkm+207ec0
FOLLOWUP_NAME:  MachineOwner
MODULE_NAME: nvlddmkm
IMAGE_NAME:  nvlddmkm.sys
DEBUG_FLR_IMAGE_TIMESTAMP:  4ecd9f33
STACK_COMMAND:  .cxr 0xfffff880031f60b0 ; kb
FAILURE_BUCKET_ID:  X64_0x7E_nvlddmkm+207ec0
BUCKET_ID:  X64_0x7E_nvlddmkm+207ec0
Followup: MachineOwner