Occasional BSOD, but mainly Crashes and reboots when watching Videos

I'm not sure if anyone else has posted, but both my step-dad and I are having the same issues with both our computers.

He bought a new computer, and I'm 99.99% sure that none of his hardware or software has any conflicts or any issues.

I have my copmuter, which i've upgraded over a period of time, and its pretty decent. I recently upgraded to Gigabyte's ATi Radeon HD5870 1GBDDR5 video card, and even more recently upgraded to Windows 7 Enterprise 32 bit.

His computer is Windows 7 as well, and he recently bought two Gigabyte ATi Radeon HD5870 1GBDDR5 video cards and ran them in Xfire.

Now we both seem to have nice and speedy computers, nothing seems wrong, until we try to go on Youtube to watch a video( when we actually try to play the video, not actually just being on the site itself). Or , in his case, try to watch a Blu Ray disc with his computer ( he's got a blu ray player)

We occasionally got the BSOD, but generally we just blackscreened and it rebooted itself. =S

So I want to know if anyone else is having this issue? I've updated the drivers to the latest to date and all that shizzle, but my guess is that the 5870's have comp. issues with Windows7?

Can you update minidump files so that we can take a look
https://www.sevenforums.com/crash-loc...d-problem.html

Can you run system file check to see if everything is ok
Start-->type cmd in search box and run it as administrator--> in cmd command window type in sfc /scannow (space between sfc and /)
Also, atikmpag.sys, which is your ATI Video driver, please install and download fresh copy of it
here is the bugcheck

Code:

Microsoft (R) Windows Debugger Version 6.12.0002.633 X86
Copyright (c) Microsoft Corporation. All rights reserved.

Loading Dump File [C:\Users\TUANTR~1\AppData\Local\Temp\Rar$DI09.010\061510-19593-01.dmp]
Mini Kernel Dump File: Only registers and stack trace are available
Symbol search path is: SRV*e:\symbols*http://msdl.microsoft.com/download/symbols
Executable search path is: 
Windows 7 Kernel Version 7600 MP (4 procs) Free x86 compatible
Product: WinNt, suite: TerminalServer SingleUserTS
Built by: 7600.16539.x86fre.win7_gdr.100226-1909
Machine Name:
Kernel base = 0x82a4d000 PsLoadedModuleList = 0x82b95810
Debug session time: Tue Jun 15 13:51:01.351 2010 (UTC + 7:00)
System Uptime: 0 days 0:48:16.255
Loading Kernel Symbols
...............................................................
................................................................
.........................
Loading User Symbols
Loading unloaded module list
.....
2: kd> !analyze
*******************************************************************************
*                                                                             *
*                        Bugcheck Analysis                                    *
*                                                                             *
*******************************************************************************
Use !analyze -v to get detailed debugging information.
BugCheck 116, {85b3d008, 90b0018e, 0, 2}
*** WARNING: Unable to verify timestamp for atikmpag.sys
*** ERROR: Module load completed but symbols could not be loaded for atikmpag.sys
Probably caused by : atikmpag.sys ( atikmpag+518e )
Followup: MachineOwner
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Tell us result when u r done:)

can you please upload new minidump file?