BSOD DRIVER_IRQL blah blah

Ok, i have just recently built a new computer with the following specs
1.8 dual pentium E2160 (oc'ed to 2.3ghz - running good)
2 gigs OCZ platinum DDR2-800
2 XFX8600GT (running SLI)
320gb SATA Western Digital hard drive
XFX 680LT-SLI board

Everything was running fine until I upgraded from my ECS board, to the XFX (go figure, isnt that backwards?). And, the error is kinda intermittent which makes it a real pain. Most of the time, it will run fine, then sometimes it will BSOD on startup, at which point I unplug all periphials except for the monitor and keyboard, and it boots fine. Plug everything else in, and it works. I can play CoD4 perfectly fine, online as well with low ping. If I play Warrock though, it will work fine sometimes, and other times I get bad frame skipping, and sometimes it will just crash the game entirely. I have tested (and replaced) the ram, replaced the mobo once and its still happening. I do have the first packet technology by nVidia turned on, but it seemed to do the same thing without that turned on as well. Any suggestions. Here is an event viewer error I got when it BSODed on startup

Event Type: Information
Event Source: Save Dump
Event Category: None
Event ID: 1001
Date: 3/2/2008
Time: 6:40:11 PM
User: N/A
Computer: SHAUN-B04B3D7EF
Description:
The computer has rebooted from a bugcheck. The bugcheck was: 0x100000d1 (0x00000008, 0x00000002, 0x00000000, 0xb49bf81f). A dump was saved in: C:\WINDOWS\Minidump\Mini030208-01.dmp.

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That was at the boot, here is another one, that I believed happened when the game crashed

Event Type: Error
Event Source: System Error
Event Category: (102)
Event ID: 1003
Date: 3/2/2008
Time: 6:43:48 PM
User: N/A
Computer: SHAUN-B04B3D7EF
Description:
Error code 100000d1, parameter1 00000008, parameter2 00000002, parameter3 00000000, parameter4 b49bf81f.

For more information, see Help and Support Center at
Data:
0000: 53 79 73 74 65 6d 20 45 System E
0008: 72 72 6f 72 20 20 45 72 rror Er
0010: 72 6f 72 20 63 6f 64 65 ror code
0018: 20 31 30 30 30 30 30 64 100000d
0020: 31 20 20 50 61 72 61 6d 1 Param
0028: 65 74 65 72 73 20 30 30 eters 00
0030: 30 30 30 30 30 38 2c 20 000008,
0038: 30 30 30 30 30 30 30 32 00000002
0040: 2c 20 30 30 30 30 30 30 , 000000
0048: 30 30 2c 20 62 34 39 62 00, b49b
0050: 66 38 31 66 f81f


I dont know what any of this means, as this is a new area of computers I guess im going to have to begin learning. I also have minidumps, I just do not know how to read them.

I have attatched the minidumps, and there are a total of 5 or 6. Thanks for any help anyone can give me on this.

0xD1 errors are due to device drivers trying to access an IRQL address they have no right to resulting in the BSOD.

The driver cited in all five minidumps is NVTcp.sys which is an Nvidia firewall driver. A lot of people over the years have had issues with Nvidia's firewall.

In fact, when I built my last rig I was told by many NOT to install the Nvidia firewall.

I would see if you can update the drivers and gain stability.

I dont remember installing the nvidia firewall. I did install their network access manager (which probably has their firewall in it). I will uninstall and see what happens. Thank you.
P.s. How did you view the minidump?

There is a thing called DeBugging Tools for Windows. If you google it you can find it. I learned to do it because of my own BSODs and the help I received here.