Windows 7 pc has just started BSOD two times today.

[FONT=lucida console]**************************Fri Aug 24 10:27:56.891 2012 (UTC - 4:00)**************************
Loading Dump File [C:\Users\John\_jcgriff2_\dbug\__Kernel__\082412-6021-01.dmp]
Windows 7 Kernel Version [B]7601 [/B](Service Pack 1) MP (8 procs) Free x64
Built by: [B]7601[/B].17835.amd64fre.win7sp1_gdr.120503-2030
System Uptime:[B]0 days 0:17:54.484[/B]
BugCheck Code: [B]BugCheck 1E, {0, 0, 0, 0}[/B]
*** WARNING: Unable to verify timestamp for win32k.sys
*** ERROR: Module load completed but symbols could not be loaded for win32k.sys
Probably caused by :[B]hardware ( nt!KiKernelCalloutExceptionHandler+e )[/B]
BugCheck Info: [B]KMODE_EXCEPTION_NOT_HANDLED (1e)[/B]
DEFAULT_BUCKET_ID:  WIN7_DRIVER_FAULT
BUGCHECK_STR:  0x1E
PROCESS_NAME: [B]System[/B]
FAILURE_BUCKET_ID: [B]X64_IP_MISALIGNED[/B]
CPUID:        "Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz"
MaxSpeed:     3400
CurrentSpeed:[B]3502[/B]
  BIOS Version                  0610
  BIOS Release Date             05/08/2012
  Manufacturer                  System manufacturer
  Product Name                  System Product Name
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨``
**************************Fri Aug 24 10:02:16.009 2012 (UTC - 4:00)**************************
Loading Dump File [C:\Users\John\_jcgriff2_\dbug\__Kernel__\082412-5865-01.dmp]
Windows 7 Kernel Version [B]7601 [/B](Service Pack 1) MP (8 procs) Free x64
Built by: [B]7601[/B].17835.amd64fre.win7sp1_gdr.120503-2030
System Uptime:[B]0 days 1:08:40.602[/B]
BugCheck Code: [B]BugCheck 50, {ffffffffffffffe8, 0, fffff88004739d7e, 0}[/B]
*** WARNING: Unable to verify timestamp for win32k.sys
*** ERROR: Module load completed but symbols could not be loaded for win32k.sys
Probably caused by :[B]dxgmms1.sys ( dxgmms1!VIDMM_GLOBAL::IsPagingOperationPending+52 )[/B]
BugCheck Info: [B]PAGE_FAULT_IN_NONPAGED_AREA (50)[/B]
DEFAULT_BUCKET_ID:  WIN7_DRIVER_FAULT
BUGCHECK_STR:  0x50
PROCESS_NAME: [B]System[/B]
FAILURE_BUCKET_ID: [B]X64_0x50_dxgmms1!VIDMM_GLOBAL::IsPagingOperationPending+52[/B]
CPUID:        "Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz"
MaxSpeed:     3400
CurrentSpeed:[B]3502[/B]
  BIOS Version                  0610
  BIOS Release Date             05/08/2012
  Manufacturer                  System manufacturer
  Product Name                  System Product Name
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨``
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[FONT=lucida console]**************************Fri Aug 24 10:27:56.891 2012 (UTC - 4:00)**************************
hamachi.sys                 Thu Feb 19 05:36:41 2009 (499D3639)
intelppm.sys                Mon Jul 13 19:19:25 2009 (4A5BC0FD)
RtNdPt60.sys                Sun Jul 19 22:27:32 2009 (4A63D614)
amdxata.sys                 Fri Mar 19 12:18:18 2010 (4BA3A3CA)
AsUpIO.sys                  Mon Aug  2 22:47:59 2010 (4C57835F)
ICCWDT.sys                  Wed Aug 18 04:27:45 2010 (4C6B9981)
AsIO.sys                    Mon Aug 23 21:53:02 2010 (4C7325FE)
ALSysIO64.sys               Sat Jul  9 20:27:45 2011 (4E18F201)
ndisrd.sys                  Fri Aug 12 06:14:50 2011 (4E44FD1A)
ASUSFILTER.sys              Tue Sep 20 11:46:33 2011 (4E78B559)
Rt64win7.sys                Tue Sep 27 10:50:33 2011 (4E81E2B9)
HECIx64.sys                 Wed Nov  9 19:52:25 2011 (4EBB2049)
iaStor.sys                  Tue Nov 29 22:39:19 2011 (4ED5A567)
RTKVHD64.sys                Tue Dec 13 05:24:54 2011 (4EE727F6)
iusb3hub.sys                Thu Jan  5 06:54:43 2012 (4F058F83)
iusb3xhc.sys                Thu Jan  5 06:54:45 2012 (4F058F85)
iusb3hcs.sys                Thu Jan  5 06:56:40 2012 (4F058FF8)
MpFilter.sys                Fri Mar  9 06:05:26 2012 (4F59E3F6)
AtihdW76.sys                Fri May 11 04:25:40 2012 (4FACCD04)
atikmpag.sys                Fri Jul 27 21:14:47 2012 (50133D07)
atikmdag.sys                Fri Jul 27 21:48:09 2012 (501344D9)
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