bsod help included zip report

hi hoping for some help, im getting bsod at random times and not sure hy, ive done all the checks and have included it in this thread. the computer is just over a year old and the problems started about 3 weeksish ago, thanks for any help in advance.

Code:

Loading Dump File [C:\Users\Mike\Downloads\BSODDmpFiles\mmarobster\Windows_NT6_BSOD_jcgriff2\123011-26832-01.dmp]
Mini Kernel Dump File: Only registers and stack trace are available

Symbol search path is: SRV*c:\users\mike\documents\symbols*http://msdl.microsoft.com/download/symbols
Executable search path is: 
Windows 7 Kernel Version 7601 (Service Pack 1) MP (3 procs) Free x64
Product: WinNt, suite: TerminalServer SingleUserTS Personal
Built by: 7601.17640.amd64fre.win7sp1_gdr.110622-1506
Machine Name:
Kernel base = 0xfffff800`03404000 PsLoadedModuleList = 0xfffff800`03649670
Debug session time: Thu Dec 29 19:20:56.725 2011 (UTC - 7:00)
System Uptime: 0 days 9:00:52.208
Loading Kernel Symbols
...............................................................
................................................................
..........................
Loading User Symbols
Loading unloaded module list
.......
*******************************************************************************
*                                                                             *
*                        Bugcheck Analysis                                    *
*                                                                             *
*******************************************************************************

Use !analyze -v to get detailed debugging information.

BugCheck 1A, {5003, fffff70001080000, cc81, b76100019802}

Probably caused by : ntkrnlmp.exe ( nt! ?? ::FNODOBFM::`string'+46f0d )

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

2: kd> !analyze -v
*******************************************************************************
*                                                                             *
*                        Bugcheck Analysis                                    *
*                                                                             *
*******************************************************************************

MEMORY_MANAGEMENT (1a)
    # Any other values for parameter 1 must be individually examined.
Arguments:
Arg1: 0000000000005003, The subtype of the bugcheck.
Arg2: fffff70001080000
Arg3: 000000000000cc81
Arg4: 0000b76100019802

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


BUGCHECK_STR:  0x1a_5003

CUSTOMER_CRASH_COUNT:  1

DEFAULT_BUCKET_ID:  VISTA_DRIVER_FAULT

PROCESS_NAME:  firefox.exe

CURRENT_IRQL:  0

LAST_CONTROL_TRANSFER:  from fffff8000341474c to fffff80003480c40

STACK_TEXT:  
fffff880`079a1ab8 fffff800`0341474c : 00000000`0000001a 00000000`00005003 fffff700`01080000 00000000`0000cc81 : nt!KeBugCheckEx
fffff880`079a1ac0 fffff800`0347ed6e : 00000000`00000001 00000000`07094000 00000000`0c920401 00000000`00000140 : nt! ?? ::FNODOBFM::`string'+0x46f0d
fffff880`079a1c20 00000000`63204519 : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : nt!KiPageFault+0x16e
00000000`0051c268 00000000`00000000 : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : 0x63204519


STACK_COMMAND:  kb

FOLLOWUP_IP: 
nt! ?? ::FNODOBFM::`string'+46f0d
fffff800`0341474c cc              int     3

SYMBOL_STACK_INDEX:  1

SYMBOL_NAME:  nt! ?? ::FNODOBFM::`string'+46f0d

FOLLOWUP_NAME:  MachineOwner

MODULE_NAME: nt

IMAGE_NAME:  ntkrnlmp.exe

DEBUG_FLR_IMAGE_TIMESTAMP:  4e02aaa3

FAILURE_BUCKET_ID:  X64_0x1a_5003_nt!_??_::FNODOBFM::_string_+46f0d

BUCKET_ID:  X64_0x1a_5003_nt!_??_::FNODOBFM::_string_+46f0d

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

This was a Memory Management crash.

Run the boot version of Memtest86+ paying close attention to Parts 2 and 3 of the tutorial. Also, in case Memtest86+ misses anything and comes up with no errors, run the extended version of the Windows Memory Diagnostics Tool for at least five passes. These you may want to run overnight since they take a long time to complete.

Update the following drivers using Installing and updating drivers in 7,
Driver Reference Table - sysnative.com - MVP,
and Drivers and Downloads as references.

Code:

RimSerial_AMD64	fffff880`0f2b3000	fffff880`0f2bac00	Mon Nov 24 10:01:01 2008 (492addcd)	00016de0		RimSerial_AMD64.sys
vsmraid	fffff880`01096000	fffff880`010c0000	Fri Jan 30 18:18:57 2009 (4983a701)	00028def		vsmraid.sys
GEARAspiWDM	fffff880`05a84000	fffff880`05a91000	Mon May 18 06:17:04 2009 (4a1151c0)	000159b4		GEARAspiWDM.sys

I also note Norton on your system. Download and run the Norton Removal Tool to remove Norton and replace it with Microsoft Security Essentials - Free Antivirus for Windows to run with Windows firewall (at least for testing).