Windows Crashes.. Need Help!

Windows 7 constantly crashes on me (BSOD). Not sure if its hardware or software issue looking for some help.

I seem to have random windows crashes. My AVG tends to have issues when starting up. Saying Resident Shield is inactive or the firewall is turned off and they wont turn back on until I reboot. At the bottom I pasted an error report that I seem to be getting frequently, and I have attached my latest windows dump files...

Here is my system...
-GIGABYTE GA-P55A-UD7
-Western Digital Caviar Black WD1002FAEX 1TB 7200 RPM
-G.SKILL 2GB (4 x 1GB) 184-Pin DDR SDRAM DDR 400
-Intel Core i5-750
-Radeon 5770 HD Graphics Card
-Rosewill RX850-S-B 850W Power Supply
-LG Blu-ray
-SABRENT CRW-UINB 68-in-1 USB 2.0 Internal Card Reader
-Hauppauge WinTV HVR-1250 Hybrid TV Tuner
-Windows 7

Here is my last error report...

Code:

 
Log Name: System
Source: Microsoft-Windows-Kernel-Power
Date: 5/8/2010 5:24:54 PM
Event ID: 41
Task Category: (63)
Level: Critical
Keywords: (2)
User: SYSTEM
Computer: agobel-PC
Description:
The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="Microsoft-Windows-Kernel-Power" Guid="{331C3B3A-2005-44C2-AC5E-77220C37D6B4}" />
<EventID>41</EventID>
<Version>2</Version>
<Level>1</Level>
<Task>63</Task>
<Opcode>0</Opcode>
<Keywords>0x8000000000000002</Keywords>
<TimeCreated SystemTime="2010-05-08T22:24:54.103223900Z" />
<EventRecordID>15449</EventRecordID>
<Correlation />
<Execution ProcessID="4" ThreadID="8" />
<Channel>System</Channel>
<Computer>agobel-PC</Computer>
<Security UserID="S-1-5-18" />
</System>
<EventData>
<Data Name="BugcheckCode">26</Data>
<Data Name="BugcheckParameter1">0x41790</Data>
<Data Name="BugcheckParameter2">0xfffffa800626d4b0</Data>
<Data Name="BugcheckParameter3">0xffff</Data>
<Data Name="BugcheckParameter4">0x0</Data>
<Data Name="SleepInProgress">false</Data>
<Data Name="PowerButtonTimestamp">0</Data>
</EventData>
</Event>

Correction my memory is... G.SKILL Ripjaws Series 8GB (4 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800). That other memory is from my old computer