My Laptop BSOD 4 times in the last 90 days. Please help!!

Question

HI, when I am surfing the internet using firefox my computer freezes and BSOD'ed. This doesn't happen often maybe like 4 times in the last 90days with the error. Below is the dump log. What can I do to prevent this from happening again?
*                        Bugcheck Analysis                                   
PAGE_FAULT_IN_NONPAGED_AREA (50)
Invalid system memory was referenced.  This cannot be protected by try-except,
it must be protected by a Probe.  Typically the address is just plain bad or it
is pointing at freed memory.
Arguments:
Arg1: ffffffff819ff390, memory referenced.
Arg2: 0000000000000000, value 0 = read operation, 1 = write operation.
Arg3: fffff8800164666f, If non-zero, the instruction address which referenced the bad memory
 address.
Arg4: 0000000000000005, (reserved)
Debugging Details:
Could not read faulting driver name
READ_ADDRESS: GetPointerFromAddress: unable to read from fffff80002eb0100
GetUlongFromAddress: unable to read from fffff80002eb01c0
 ffffffff819ff390
FAULTING_IP:
lcencvm+1766f
fffff880`0164666f 66f2af          repne scas word ptr [rdi]
MM_INTERNAL_CODE:  5
CUSTOMER_CRASH_COUNT:  1
DEFAULT_BUCKET_ID:  WIN7_DRIVER_FAULT
BUGCHECK_STR:  0x50
PROCESS_NAME:  firefox.exe
CURRENT_IRQL:  0
TRAP_FRAME:  fffff8800a532640 -- (.trap 0xfffff8800a532640)
NOTE: The trap frame does not contain all registers.
Some register values may be zeroed or incorrect.
rax=0000000000000000 rbx=0000000000000000 rcx=ffffffffffffffff
rdx=ffffffff819ff390 rsi=0000000000000000 rdi=0000000000000000
rip=fffff8800164666f rsp=fffff8800a5327d0 rbp=fffffa8007113950
 r8=0000000000000000  r9=0000000000000000 r10=fffff80002e08588
r11=fffffa800e305ac0 r12=0000000000000000 r13=0000000000000000
r14=0000000000000000 r15=0000000000000000
iopl=0         nv up ei ng nz na po nc
lcencvm+0x1766f:
fffff880`0164666f 66f2af          repne scas word ptr [rdi]
Resetting default scope
LAST_CONTROL_TRANSFER:  from fffff80002cf5603 to fffff80002c79e80
STACK_TEXT: 
fffff880`0a5324d8 fffff800`02cf5603 : 00000000`00000050 ffffffff`819ff390 00000000`00000000 fffff880`0a532640 : nt!KeBugCheckEx
fffff880`0a5324e0 fffff800`02c77fae : 00000000`00000000 ffffffff`819ff390 fffffa80`06d03000 fffffa80`07904140 : nt! ?? ::FNODOBFM::`string'+0x43801
fffff880`0a532640 fffff880`0164666f : fffffa80`07904140 00000000`00000801 fffff880`0a5327e0 20206f49`0a5327e0 : nt!KiPageFault+0x16e
fffff880`0a5327d0 fffffa80`07904140 : 00000000`00000801 fffff880`0a5327e0 20206f49`0a5327e0 fffffa80`0d884660 : lcencvm+0x1766f
fffff880`0a5327d8 00000000`00000801 : fffff880`0a5327e0 20206f49`0a5327e0 fffffa80`0d884660 00000000`0012019f : 0xfffffa80`07904140
fffff880`0a5327e0 fffff880`0a5327e0 : 20206f49`0a5327e0 fffffa80`0d884660 00000000`0012019f fffff8a0`00005e30 : 0x801
fffff880`0a5327e8 20206f49`0a5327e0 : fffffa80`0d884660 00000000`0012019f fffff8a0`00005e30 00000000`00000000 : 0xfffff880`0a5327e0
fffff880`0a5327f0 fffffa80`0d884660 : 00000000`0012019f fffff8a0`00005e30 00000000`00000000 00000000`00f8000c : 0x20206f49`0a5327e0
fffff880`0a5327f8 00000000`0012019f : fffff8a0`00005e30 00000000`00000000 00000000`00f8000c fffff800`02d15f4f : 0xfffffa80`0d884660
fffff880`0a532800 fffff8a0`00005e30 : 00000000`00000000 00000000`00f8000c fffff800`02d15f4f 00000040`00000003 : 0x12019f
fffff880`0a532808 00000000`00000000 : 00000000`00f8000c fffff800`02d15f4f 00000040`00000003 00000000`00000000 : 0xfffff8a0`00005e30
STACK_COMMAND:  kb
FOLLOWUP_IP:
lcencvm+1766f
fffff880`0164666f 66f2af          repne scas word ptr [rdi]
SYMBOL_STACK_INDEX:  3
SYMBOL_NAME:  lcencvm+1766f
FOLLOWUP_NAME:  MachineOwner
MODULE_NAME: lcencvm
IMAGE_NAME:  lcencvm.sys
DEBUG_FLR_IMAGE_TIMESTAMP:  502d3a35
FAILURE_BUCKET_ID:  X64_0x50_lcencvm+1766f
BUCKET_ID:  X64_0x50_lcencvm+1766f
Followup: MachineOwner
 

Answer 1

RI
These were related to lcencvm.sys is an integral part of SafeGuard FileEncryption product of Utimaco Safeware AG.  I would remove it and use MSE in its place (at least to test) 
http://www.microsoft.com/security_essentials/
Microsoft (R) Windows Debugger Version 6.3.9600.17298 AMD64
Copyright (c) Microsoft Corporation. All rights reserved.
Loading Dump File [C:\Users\zigza\Desktop\040615-10374-01\040615-10374-01.dmp]
Mini Kernel Dump File: Only registers and stack trace are available
************* Symbol Path validation summary **************
Response Time (ms) Location
Deferred SRV*D:\Symbols*http://msdl.microsoft.com/download/symbols
Symbol search path is: SRV*D:\Symbols*http://msdl.microsoft.com/download/symbols
Executable search path is:
Windows 7 Kernel Version 7601 (Service Pack 1) MP (4 procs) Free x64
Product: WinNt, suite: TerminalServer SingleUserTS
Built by: 7601.18741.amd64fre.win7sp1_gdr.150202-1526
Machine Name:
Kernel base = 0xfffff800`02c18000 PsLoadedModuleList = 0xfffff800`02e5c890
Debug session time: Mon Apr 6 13:11:11.096 2015 (UTC - 4:00)
System Uptime: 10 days 2:00:58.659
Loading Kernel Symbols
Loading User Symbols
Loading unloaded module list
* Bugcheck Analysis *
Use !analyze -v to get detailed debugging information.
BugCheck 50, {ffffffffae07f4e8, 0, fffff880016b866f, 5}
*** WARNING: Unable to verify timestamp for lcencvm.sys
*** ERROR: Module load completed but symbols could not be loaded for lcencvm.sys
Could not read faulting driver name
Probably caused by : lcencvm.sys ( lcencvm+1766f )
Followup: MachineOwner
0: kd> !analyze -v
* Bugcheck Analysis *
PAGE_FAULT_IN_NONPAGED_AREA (50)
Invalid system memory was referenced. This cannot be protected by try-except,
it must be protected by a Probe. Typically the address is just plain bad or it
is pointing at freed memory.
Arguments:
Arg1: ffffffffae07f4e8, memory referenced.
Arg2: 0000000000000000, value 0 = read operation, 1 = write operation.
Arg3: fffff880016b866f, If non-zero, the instruction address which referenced the bad memory
address.
Arg4: 0000000000000005, (reserved)
Debugging Details:
Could not read faulting driver name
READ_ADDRESS: GetPointerFromAddress: unable to read from fffff80002ec6100
GetUlongFromAddress: unable to read from fffff80002ec61c0
ffffffffae07f4e8
FAULTING_IP:
lcencvm+1766f
fffff880`016b866f 66f2af repne scas word ptr [rdi]
MM_INTERNAL_CODE: 5
CUSTOMER_CRASH_COUNT: 1
DEFAULT_BUCKET_ID: WIN7_DRIVER_FAULT
BUGCHECK_STR: 0x50
PROCESS_NAME: firefox.exe
CURRENT_IRQL: 0
ANALYSIS_VERSION: 6.3.9600.17298 (debuggers(dbg).141024-1500) amd64fre
TRAP_FRAME: fffff8800f362640 -- (.trap 0xfffff8800f362640)
NOTE: The trap frame does not contain all registers.
Some register values may be zeroed or incorrect.
rax=0000000000000000 rbx=0000000000000000 rcx=ffffffffffffffff
rdx=ffffffffae07f4e8 rsi=0000000000000000 rdi=0000000000000000
rip=fffff880016b866f rsp=fffff8800f3627d0 rbp=fffffa8007080120
r8=0000000000000000 r9=0000000000000000 r10=0000000031465045
r11=0000000000000000 r12=0000000000000000 r13=0000000000000000
r14=0000000000000000 r15=0000000000000000
iopl=0 nv up ei ng nz na po nc
lcencvm+0x1766f:
fffff880`016b866f 66f2af repne scas word ptr [rdi]
Resetting default scope
LAST_CONTROL_TRANSFER: from fffff80002d0a873 to fffff80002c8cec0
STACK_TEXT:
fffff880`0f3624d8 fffff800`02d0a873 : 00000000`00000050 ffffffff`ae07f4e8 00000000`00000000 fffff880`0f362640 : nt!KeBugCheckEx
fffff880`0f3624e0 fffff800`02c8afee : 00000000`00000000 ffffffff`ae07f4e8 fffffa80`06d03000 fffffa80`0de28800 : nt! ?? ::FNODOBFM::`string'+0x43801
fffff880`0f362640 fffff880`016b866f : fffffa80`0de28800 00000000`00000801 fffff880`0f3627e0 20206f49`0f3627e0 : nt!KiPageFault+0x16e
fffff880`0f3627d0 fffffa80`0de28800 : 00000000`00000801 fffff880`0f3627e0 20206f49`0f3627e0 fffffa80`0fea5680 : lcencvm+0x1766f
fffff880`0f3627d8 00000000`00000801 : fffff880`0f3627e0 20206f49`0f3627e0 fffffa80`0fea5680 00000000`0012019f : 0xfffffa80`0de28800
fffff880`0f3627e0 fffff880`0f3627e0 : 20206f49`0f3627e0 fffffa80`0fea5680 00000000`0012019f fffff8a0`00005e30 : 0x801
fffff880`0f3627e8 20206f49`0f3627e0 : fffffa80`0fea5680 00000000`0012019f fffff8a0`00005e30 00000000`00000000 : 0xfffff880`0f3627e0
fffff880`0f3627f0 fffffa80`0fea5680 : 00000000`0012019f fffff8a0`00005e30 00000000`00000000 00000000`00f8000c : 0x20206f49`0f3627e0
fffff880`0f3627f8 00000000`0012019f : fffff8a0`00005e30 00000000`00000000 00000000`00f8000c fffff800`02d2b1cf : 0xfffffa80`0fea5680
fffff880`0f362800 fffff8a0`00005e30 : 00000000`00000000 00000000`00f8000c fffff800`02d2b1cf 00000040`00000001 : 0x12019f
fffff880`0f362808 00000000`00000000 : 00000000`00f8000c fffff800`02d2b1cf 00000040`00000001 00000000`00000000 : 0xfffff8a0`00005e30
STACK_COMMAND: kb
FOLLOWUP_IP:
lcencvm+1766f
fffff880`016b866f 66f2af repne scas word ptr [rdi]
SYMBOL_STACK_INDEX: 3
SYMBOL_NAME: lcencvm+1766f
FOLLOWUP_NAME: MachineOwner
MODULE_NAME: lcencvm
IMAGE_NAME: lcencvm.sys
DEBUG_FLR_IMAGE_TIMESTAMP: 502d3a35
FAILURE_BUCKET_ID: X64_0x50_lcencvm+1766f
BUCKET_ID: X64_0x50_lcencvm+1766f
ANALYSIS_SOURCE: KM
FAILURE_ID_HASH_STRING: km:x64_0x50_lcencvm+1766f
FAILURE_ID_HASH: {efa0306d-354a-172c-cb23-f819c623f8c8}
Followup: MachineOwner
Wanikiya and Dyami--Team Zigzag