Please provide this information so we can provide a complete analysis:  
Link Removed
Memory dump blames the Asus Data Security Manager driver - AsDsm.sys (which dates from 2007).  Please un-install it.
Please update these older drivers. Links are included to assist in looking up the source of the drivers. If unable to find an update, please remove (un-install) the program responsible for that driver. DO NOT manually delete/rename the driver as it may make the system unbootable! :
ghaio.sys                   Mon May 30 05:34:05 2005 (429ADE0D)
ASUS NB Probe program
Link Removed
 
ASMMAP64.sys                Sun Feb  4 14:52:56 2007 (45C63998)
LENOVO ATK Hotkey ATK0101 ACPI UTILITY
Link Removed
 
sncduvc.SYS                 Wed May  9 03:17:09 2007 (46417575)
Suyin USB 2.0 Webcam driver
Link Removed
 
AsDsm.sys                   Fri Aug 10 08:16:30 2007 (46BC571E)
Asus Data Security Manager Driver
Link Removed
 
snp2uvc.sys                 Tue Apr  1 03:14:00 2008 (47F1E0B8)
Suyin USB 2.0 Webcam driver
Link Removed
 
kbfiltr.sys                 Wed May  7 01:24:36 2008 (48213D14)
Dritek Keyboard Filter Driver
Link Removed
 
iaStor.sys                  Wed May  7 20:15:59 2008 (4822463F)
Intel Storage drivers
Link Removed
 
lullaby.sys                 Tue May 27 02:37:24 2008 (483BAC24)
ASUS CopyProtect driver
Link Removed
 
RTKVHD64.sys                Tue Jun 17 04:50:25 2008 (48577AD1)
Realtek High Definition Audio Function Driver
Link Removed
 
nvoclk64.sys                Tue Jan  6 18:47:08 2009 (4963ED7C)
nVidia System Utility Driver
Link Removed
 
nvflsh64.sys                Wed Jan  7 19:10:51 2009 (4965448B)
NVIDIA nForce MCP Networking Driver
Link Removed
 
btwl2cap.sys                Fri Apr  3 20:28:45 2009 (49D6A9BD)
Broadcom Bluetooth L2CAP Servicen
Link Removed
 
ATK64AMD.sys                Tue May 12 21:04:54 2009 (4A0A1CB6)
ATK Hotkey ATK0101 ACPI UTILITY Driver
Link Removed
 
rimspx64.sys                Thu Jun 25 03:13:43 2009 (4A4323A7)
Ricoh Memory Card Reader driver
Link Removed
 
rixdpx64.sys                Thu Jun 25 03:38:50 2009 (4A43298A)
Ricoh Memory Card Reader driver
Link Removed
 
rimmpx64.sys                Thu Jun 25 04:04:18 2009 (4A432F82)
Ricoh Memory Card Reader driver
Link Removed
 
Analysis:
The following is for informational purposes only.
	
	
	
		Code:
	
	
		[font=lucida console]**************************Sun Apr 21 21:45:16.554 2013 (UTC - 4:00)**************************
Loading Dump File [C:\Users\Owner\SysnativeBSODApps\042113-41995-01.dmp]
Windows 7 Kernel Version 7601 (Service Pack 1) MP (2 procs) Free x64
Built by: [B]7601[/B].18113.amd64fre.win7sp1_gdr.130318-1533
System Uptime:[B]0 days 0:11:44.396[/B]
*** WARNING: Unable to verify timestamp for AsDsm.sys
*** ERROR: Module load completed but symbols could not be loaded for AsDsm.sys
Probably caused by :[B]AsDsm.sys ( AsDsm+2343 )[/B]
BugCheck [B]BE, {fffff8a002b9a000, 8000000045918101, fffff8800d092410, b}[/B]
BugCheck Info: [B]Link Removed[/B]
Arguments: 
Arg1: fffff8a002b9a000, Virtual address for the attempted write.
Arg2: 8000000045918101, PTE contents.
Arg3: fffff8800d092410, (reserved)
Arg4: 000000000000000b, (reserved)
BUGCHECK_STR:  0xBE
DEFAULT_BUCKET_ID:  WIN7_DRIVER_FAULT
PROCESS_NAME:  WDFME.exe
FAILURE_BUCKET_ID: [B]X64_0xBE_AsDsm+2343[/B]
CPUID:        "Intel(R) Core(TM)2 Duo CPU     P7450  @ 2.13GHz"
MaxSpeed:     2130
CurrentSpeed: [B]2128[/B]
  BIOS Version                  213    
  BIOS Release Date             04/21/2009
  Manufacturer                  ASUSTeK Computer Inc.        
  Product Name                  G50VT               
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨``
[/font]
	 
 
3rd Party Drivers:
The following is for information purposes only.
Any drivers in red should be updated or removed from your system. And should have been discussed in the body of my post.
	
	
	
		Code:
	
	
		[font=lucida console]**************************Sun Apr 21 21:45:16.554 2013 (UTC - 4:00)**************************
[B]ghaio.sys                   Mon May 30 05:34:05 2005 (429ADE0D)[/B]
[B]ASMMAP64.sys                Sun Feb  4 14:52:56 2007 (45C63998)[/B]
[B]sncduvc.SYS                 Wed May  9 03:17:09 2007 (46417575)[/B]
[B]AsDsm.sys                   Fri Aug 10 08:16:30 2007 (46BC571E)[/B]
[B]snp2uvc.sys                 Tue Apr  1 03:14:00 2008 (47F1E0B8)[/B]
[B]kbfiltr.sys                 Wed May  7 01:24:36 2008 (48213D14)[/B]
[B]iaStor.sys                  Wed May  7 20:15:59 2008 (4822463F)[/B]
[B]lullaby.sys                 Tue May 27 02:37:24 2008 (483BAC24)[/B]
[B]RTKVHD64.sys                Tue Jun 17 04:50:25 2008 (48577AD1)[/B]
[B]nvoclk64.sys                Tue Jan  6 18:47:08 2009 (4963ED7C)[/B]
[B]nvflsh64.sys                Wed Jan  7 19:10:51 2009 (4965448B)[/B]
[B]btwl2cap.sys                Fri Apr  3 20:28:45 2009 (49D6A9BD)[/B]
[B]ATK64AMD.sys                Tue May 12 21:04:54 2009 (4A0A1CB6)[/B]
[B]rimspx64.sys                Thu Jun 25 03:13:43 2009 (4A4323A7)[/B]
[B]rixdpx64.sys                Thu Jun 25 03:38:50 2009 (4A43298A)[/B]
[B]rimmpx64.sys                Thu Jun 25 04:04:18 2009 (4A432F82)[/B]
intelppm.sys                Mon Jul 13 19:19:25 2009 (4A5BC0FD)
SynTP.sys                   Mon Aug 17 14:35:16 2009 (4A89A2E4)
btwavdt.sys                 Tue Aug 25 16:35:17 2009 (4A944B05)
btwrchid.sys                Tue Aug 25 16:36:32 2009 (4A944B50)
NETw5s64.sys                Tue Sep 15 15:40:39 2009 (4AAFEDB7)
btwaudio.sys                Mon Sep 28 11:47:34 2009 (4AC0DA96)
amdxata.sys                 Fri Mar 19 12:18:18 2010 (4BA3A3CA)
btusbflt.sys                Thu Apr  8 21:11:36 2010 (4BBE7EC8)
itecir.sys                  Tue Jul 13 05:50:47 2010 (4C3C36F7)
cpuz135_x64.sys             Wed Jan 19 11:42:06 2011 (4D37145E)
ITECIRfilter.sys            Tue Mar 22 03:24:41 2011 (4D884EB9)
ctxusbm.sys                 Tue Jun  7 18:53:28 2011 (4DEEABE8)
Rt64win7.sys                Fri Jun 10 02:33:15 2011 (4DF1BAAB)
nvBridge.kmd                Wed Jun 15 04:38:14 2011 (4DF86F76)
GEARAspiWDM.sys             Thu May  3 15:56:17 2012 (4FA2E2E1)
SYMEVENT64x86.SYS           Wed May 23 20:52:24 2012 (4FBD8648)
SYMNETS.SYS                 Fri Jul 20 22:07:07 2012 (500A0ECB)
Ironx64.SYS                 Mon Jul 23 20:34:50 2012 (500DEDAA)
eeCtrl64.sys                Tue Jul 31 19:36:51 2012 (50186C13)
ccSetx64.sys                Thu Aug 16 17:18:11 2012 (502D6393)
IDSvia64.sys                Tue Aug 28 22:48:40 2012 (503D8308)
nvhda64v.sys                Wed Dec 19 00:41:41 2012 (50D15395)
EX64.SYS                    Thu Dec 20 04:22:39 2012 (50D2D8DF)
ENG64.SYS                   Thu Dec 20 04:24:21 2012 (50D2D945)
SYMDS64.SYS                 Wed Jan 16 20:56:45 2013 (50F75A5D)
SYMEFA64.SYS                Fri Jan 18 19:31:37 2013 (50F9E969)
SRTSP64.SYS                 Fri Jan 25 16:26:16 2013 (5102F878)
SRTSPX64.SYS                Fri Jan 25 16:30:05 2013 (5102F95D)
nvlddmkm.sys                Thu Mar 14 21:37:00 2013 (51427B3C)
BHDrvx64.sys                Wed Apr 10 01:39:03 2013 (5164FAF7)
[/font]
	 
 Link Removed
Link Removed
Link Removed
Link Removed
Link Removed
Link Removed
Link Removed
Link Removed
Link Removed
Link Removed
Link Removed
Link Removed
Link Removed
Link Removed
Link Removed
Link Removed
Link Removed
Link Removed
Link Removed
Link Removed
Link Removed
Link Removed
Link Removed
Link Removed
Link Removed
Link Removed
Link Removed
Link Removed
Link Removed
Link Removed
Link Removed
Link Removed
Link Removed
Link Removed
Link Removed
Link Removed
Link Removed
Link Removed
Link Removed
Link Removed
Link Removed
Link Removed
Link Removed
Link Removed
Link Removed
Link Removed