Random BSOD

Hi gabranthx33. :)
You are infected by a Rogue Antivirus ( AVA.exe ). "atikmdag.sys" also seems to be related to the problem but I believe that RA is the cause itself.
Download Malwarebytes, update it and run a full scan. Let us know the results.

Code:

Built by: 7600.16792.amd64fre.win7_gdr.110408-1633
Machine Name:
Kernel base = 0xfffff800`02c02000 PsLoadedModuleList = 0xfffff800`02e3fe50
Debug session time: Thu Jun  9 20:54:28.639 2011 (UTC - 3:00)
System Uptime: 0 days 12:22:03.935
Loading Kernel Symbols
...............................................................
................................................................
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Loading User Symbols
Loading unloaded module list
.......
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*                                                                             *
*                        Bugcheck Analysis                                    *
*                                                                             *
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Use !analyze -v to get detailed debugging information.

BugCheck 3B, {c0000005, fffff88004b9d10e, fffff8800a928790, 0}

Probably caused by : atikmdag.sys ( atikmdag+37510e )

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

1: kd> !analyze -v
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*                                                                             *
*                        Bugcheck Analysis                                    *
*                                                                             *
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SYSTEM_SERVICE_EXCEPTION (3b)
An exception happened while executing a system service routine.
Arguments:
Arg1: 00000000c0000005, Exception code that caused the bugcheck
Arg2: fffff88004b9d10e, Address of the instruction which caused the bugcheck
Arg3: fffff8800a928790, Address of the context record for the exception that caused the bugcheck
Arg4: 0000000000000000, zero.

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


EXCEPTION_CODE: (NTSTATUS) 0xc0000005 - A instru  o no 0x%08lx fez refer ncia   mem ria no 0x%08lx. A mem ria n o p de ser %s.

FAULTING_IP: 
atikmdag+37510e
fffff880`04b9d10e 8178083000bebe  cmp     dword ptr [rax+8],0BEBE0030h

CONTEXT:  fffff8800a928790 -- (.cxr 0xfffff8800a928790)
rax=000000b8000000b0 rbx=fffff8a00b87e360 rcx=fffff8a0082d31b0
rdx=fffffa800a910040 rsi=fffff8800a929430 rdi=fffff8a00bc9ee88
rip=fffff88004b9d10e rsp=fffff8800a929168 rbp=0000000000000000
 r8=fffff8a00b87e360  r9=0000000000016614 r10=00000000ffffffff
r11=fffff8a00bc9ee58 r12=fffffa800a910040 r13=fffff8a00bc9ee88
r14=000000000000009b r15=fffffa80072f6438
iopl=0         nv up ei pl nz na pe nc
cs=0010  ss=0018  ds=002b  es=002b  fs=0053  gs=002b             efl=00010202
atikmdag+0x37510e:
fffff880`04b9d10e 8178083000bebe  cmp     dword ptr [rax+8],0BEBE0030h ds:002b:000000b8`000000b8=????????
Resetting default scope

CUSTOMER_CRASH_COUNT:  1

DEFAULT_BUCKET_ID:  VISTA_DRIVER_FAULT

BUGCHECK_STR:  0x3B

PROCESS_NAME:  AVA.exe

CURRENT_IRQL:  0

LAST_CONTROL_TRANSFER:  from 0000000000000000 to fffff88004b9d10e

STACK_TEXT:  
fffff880`0a929168 00000000`00000000 : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : atikmdag+0x37510e


FOLLOWUP_IP: 
atikmdag+37510e
fffff880`04b9d10e 8178083000bebe  cmp     dword ptr [rax+8],0BEBE0030h

SYMBOL_STACK_INDEX:  0

SYMBOL_NAME:  atikmdag+37510e

FOLLOWUP_NAME:  MachineOwner

MODULE_NAME: atikmdag

IMAGE_NAME:  atikmdag.sys

DEBUG_FLR_IMAGE_TIMESTAMP:  4dae3c99

STACK_COMMAND:  .cxr 0xfffff8800a928790 ; kb

FAILURE_BUCKET_ID:  X64_0x3B_atikmdag+37510e

BUCKET_ID:  X64_0x3B_atikmdag+37510e

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

1: kd> lmvm atikmdag
start             end                 module name
fffff880`04828000 fffff880`0515c000   atikmdag T (no symbols)           
    Loaded symbol image file: atikmdag.sys
    Image path: \SystemRoot\system32\DRIVERS\atikmdag.sys
    Image name: atikmdag.sys
    Timestamp:        Tue Apr 19 22:53:29 2011 (4DAE3C99)
    CheckSum:         008E91DD
    ImageSize:        00934000
    Translations:     0000.04b0 0000.04e4 0409.04b0 0409.04e4