BSOD while Running Only Latest Skype 6

Hello Janjua.

► Install Service pack 1.

Code:

Windows 7 Kernel Version 7600 MP (4 procs) Free x64
Product: WinNt, suite: TerminalServer SingleUserTS
Built by: 7600.17118.amd64fre.win7_gdr.120830-0334

Learn how to install Windows 7 Service Pack 1 (SP1)
Service Pack Center - Microsoft Windows

► Test your RAM modules for possible errors.

Code:

*******************************************************************************
*                                                                             *
*                        Bugcheck Analysis                                    *
*                                                                             *
*******************************************************************************

Use !analyze -v to get detailed debugging information.

BugCheck 50, {fffff8804dc5e4fe, 1, fffff80002a7ecd7, 5}


Could not read faulting driver name
Probably caused by : memory_corruption

Followup: memory_corruption
---------

2: 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: fffff8804dc5e4fe, memory referenced.
Arg2: 0000000000000001, value 0 = read operation, 1 = write operation.
Arg3: fffff80002a7ecd7, If non-zero, the instruction address which referenced the bad memory
    address.
Arg4: 0000000000000005, (reserved)

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


Could not read faulting driver name

WRITE_ADDRESS: GetPointerFromAddress: unable to read from fffff80002cab0e0
GetUlongFromAddress: unable to read from fffff80002cab198
 fffff8804dc5e4fe Nonpaged pool

FAULTING_IP: 
nt!SepMandatoryIntegrityCheck+337
fffff800`02a7ecd7 8f84e3feffff45  pop     qword ptr [rbx+45FFFFFEh]

MM_INTERNAL_CODE:  5

CUSTOMER_CRASH_COUNT:  1

DEFAULT_BUCKET_ID:  CODE_CORRUPTION

BUGCHECK_STR:  0x50

PROCESS_NAME:  avgui.exe

CURRENT_IRQL:  0

TRAP_FRAME:  fffff88007c5e250 -- (.trap 0xfffff88007c5e250)
NOTE: The trap frame does not contain all registers.
Some register values may be zeroed or incorrect.
rax=00000000fffdfbef rbx=0000000000000000 rcx=00000000fffdfbef
rdx=0000000000000000 rsi=0000000000000000 rdi=0000000000000000
rip=fffff80002a7ecd7 rsp=fffff88007c5e3e0 rbp=0000000000000001
 r8=0000000000020000  r9=0000000000100000 r10=0000000000000000
r11=00000000010d0000 r12=0000000000000000 r13=0000000000000000
r14=0000000000000000 r15=0000000000000000
iopl=0         nv up ei pl nz na pe nc
nt!SepMandatoryIntegrityCheck+0x337:
fffff800`02a7ecd7 8f84e3feffff45  pop     qword ptr [rbx+45FFFFFEh] ds:00000000`45fffffe=????????????????
Resetting default scope

LAST_CONTROL_TRANSFER:  from fffff80002af25a1 to fffff80002a745c0

STACK_TEXT:  
fffff880`07c5e0e8 fffff800`02af25a1 : 00000000`00000050 fffff880`4dc5e4fe 00000000`00000001 fffff880`07c5e250 : nt!KeBugCheckEx
fffff880`07c5e0f0 fffff800`02a726ae : 00000000`00000001 fffff880`07c5e500 fffff880`00000000 00000000`00000001 : nt! ?? ::FNODOBFM::`string'+0x4038b
fffff880`07c5e250 fffff800`02a7ecd7 : fffff800`02f3d7c0 fffff8a0`055b1e38 fffff880`07c5e400 00000000`00000000 : nt!KiPageFault+0x16e
fffff880`07c5e3e0 fffff800`02a79c47 : fffff880`07c5ea10 fffff8a0`055b1a50 00000000`00000400 fffff880`07c5e9c0 : nt!SepMandatoryIntegrityCheck+0x337
fffff880`07c5e460 fffff800`02a81b1e : fffff8a0`00004710 00000000`00000000 fffff8a0`055ac250 fffff880`07c5e9f0 : nt!SeAccessCheckWithHint+0x317
fffff880`07c5e540 fffff800`02d6ada5 : fffffa80`066e7080 fffff880`07c5e9f0 00000000`00000001 00000000`00000000 : nt!SeAccessCheck+0x5e
fffff880`07c5e5b0 fffff800`02d683d1 : 00000000`00000000 00000000`00000000 fffff8a0`055ac250 00000000`00000000 : nt!ObCheckObjectAccess+0xe5
fffff880`07c5e650 fffff800`02d371d1 : 00000000`00000001 fffffa80`08b637c0 fffff8a0`00000000 00000000`c0020000 : nt!ObpCreateHandle+0x521
fffff880`07c5e760 fffff800`02d44b33 : fffffa80`06dc8060 fffff880`07c5ec60 00000000`02f9e528 00000000`00000000 : nt!ObOpenObjectByPointerWithTag+0x109
fffff880`07c5e980 fffff800`02d44c3b : 00000000`007c12e8 00000000`00000000 ffffffff`fffffffe 00000000`02f9e200 : nt!PsOpenProcess+0x1b1
fffff880`07c5eba0 fffff800`02a73813 : fffffa80`06dc8060 00000000`000005f4 00000000`00000000 fffffa80`08c50d10 : nt!NtOpenProcess+0x23
fffff880`07c5ebe0 00000000`774ef91a : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : nt!KiSystemServiceCopyEnd+0x13
00000000`02f9e4f8 00000000`00000000 : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : 0x774ef91a


STACK_COMMAND:  kb

CHKIMG_EXTENSION: !chkimg -lo 50 -d !nt
    fffff80002a7ecd7 - nt!SepMandatoryIntegrityCheck+337
    [ 0f:8f ]
1 error : !nt (fffff80002a7ecd7)

MODULE_NAME: memory_corruption

IMAGE_NAME:  memory_corruption

FOLLOWUP_NAME:  memory_corruption

DEBUG_FLR_IMAGE_TIMESTAMP:  0

MEMORY_CORRUPTOR:  ONE_BIT

FAILURE_BUCKET_ID:  X64_MEMORY_CORRUPTION_ONE_BIT

BUCKET_ID:  X64_MEMORY_CORRUPTION_ONE_BIT

Followup: memory_corruption
---------

How to Test and Diagnose RAM Issues with Memtest86+
Run memtest for at least 8 passes, preferably overnight, per RAM module per slot.

► Use Microsoft Security Essentials.
Uninstall AVG
Use Microsoft Security Essentials as your antivirus with windows inbuilt firewall, and free MBAM as the on demand scanner.

Download and install those, and then run full system scans with both of them, one by one.

MSE is a better choice as an AV program.