Random BSOD

The picture looks like textbook graphics corruption.
The crash however is clearly blaming AVAST! for your problem.

Code:

Probably caused by : aswSP.SYS ( aswSP+afaf )

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: fffffa80058ffd10, memory referenced.
Arg2: 0000000000000000, value 0 = read operation, 1 = write operation.
Arg3: fffff880078dafaf, If non-zero, the instruction address which referenced the bad memory
    address.
Arg4: 0000000000000000, (reserved)

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


Could not read faulting driver name

READ_ADDRESS: GetPointerFromAddress: unable to read from fffff800032cc100
 fffffa80058ffd10 

FAULTING_IP: 
aswSP+afaf
fffff880`078dafaf 41f644241008    test    byte ptr [r12+10h],8

MM_INTERNAL_CODE:  0

CUSTOMER_CRASH_COUNT:  1

DEFAULT_BUCKET_ID:  VISTA_DRIVER_FAULT

BUGCHECK_STR:  0x50

PROCESS_NAME:  AvastSvc.exe

CURRENT_IRQL:  0

TRAP_FRAME:  fffff880040a0720 -- (.trap 0xfffff880040a0720)
NOTE: The trap frame does not contain all registers.
Some register values may be zeroed or incorrect.
rax=0000000000000000 rbx=0000000000000000 rcx=fffffa8006ee0250
rdx=fffffa80065ecc41 rsi=0000000000000000 rdi=0000000000000000
rip=fffff880078dafaf rsp=fffff880040a08b0 rbp=fffff880040a0ac8
 r8=fffffa80065ecc40  r9=0000000000000150 r10=fffff88007914000
r11=fffffa8003eefd00 r12=0000000000000000 r13=0000000000000000
r14=0000000000000000 r15=0000000000000000
iopl=0         nv up ei pl zr na po nc
aswSP+0xafaf:
fffff880`078dafaf 41f644241008    test    byte ptr [r12+10h],8 ds:da70:00000000`00000010=??
Resetting default scope

LAST_CONTROL_TRANSFER:  from fffff80003048a0c to fffff8000309cd00

STACK_TEXT:  
fffff880`040a05b8 fffff800`03048a0c : 00000000`00000050 fffffa80`058ffd10 00000000`00000000 fffff880`040a0720 : nt!KeBugCheckEx
fffff880`040a05c0 fffff800`0309ae2e : 00000000`00000000 fffffa80`058ffd10 00000000`00000000 00000000`00000000 : nt! ?? ::FNODOBFM::`string'+0x4621f
fffff880`040a0720 fffff880`078dafaf : fffff880`040a0928 fffff800`00000001 fffff8a0`00000003 fffff800`00000000 : nt!KiPageFault+0x16e
fffff880`040a08b0 fffff880`040a0928 : fffff800`00000001 fffff8a0`00000003 fffff800`00000000 fffffa80`0604eb00 : aswSP+0xafaf
fffff880`040a08b8 fffff800`00000001 : fffff8a0`00000003 fffff800`00000000 fffffa80`0604eb00 00000000`00000801 : 0xfffff880`040a0928
fffff880`040a08c0 fffff8a0`00000003 : fffff800`00000000 fffffa80`0604eb00 00000000`00000801 00000000`00000000 : 0xfffff800`00000001
fffff880`040a08c8 fffff800`00000000 : fffffa80`0604eb00 00000000`00000801 00000000`00000000 fffff880`03ca319a : 0xfffff8a0`00000003
fffff880`040a08d0 fffffa80`0604eb00 : 00000000`00000801 00000000`00000000 fffff880`03ca319a fffffa80`058ffd00 : 0xfffff800`00000000
fffff880`040a08d8 00000000`00000801 : 00000000`00000000 fffff880`03ca319a fffffa80`058ffd00 00000000`00000000 : 0xfffffa80`0604eb00
fffff880`040a08e0 00000000`00000000 : fffff880`03ca319a fffffa80`058ffd00 00000000`00000000 fffff880`040a0b30 : 0x801


STACK_COMMAND:  kb

FOLLOWUP_IP: 
aswSP+afaf
fffff880`078dafaf 41f644241008    test    byte ptr [r12+10h],8

SYMBOL_STACK_INDEX:  3

SYMBOL_NAME:  aswSP+afaf

FOLLOWUP_NAME:  MachineOwner

MODULE_NAME: aswSP

IMAGE_NAME:  aswSP.SYS

DEBUG_FLR_IMAGE_TIMESTAMP:  4dc929b6

FAILURE_BUCKET_ID:  X64_0x50_aswSP+afaf

BUCKET_ID:  X64_0x50_aswSP+afaf

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

If you are willing to remove avast my two suggestions are ESET or MSE
Anti-Malware, Virus, Spyware Protection | Microsoft Security Essentials
MSE is free as well though. If you run it and scan manually about once a week with malwarebytes
Malwarebytes : Malwarebytes Anti-Malware is a free download that removes viruses and malware from your computer
you have a stable and relatively safe system.
Obviously you should at least turn on windows firewall as well now.