intermittent BSOD

Welcome aboard.

Code:

Use !analyze -v to get detailed debugging information.

BugCheck D1, {0, 2, 8, 0}

Probably caused by : ntkrnlmp.exe ( nt!KiPageFault+260 )

Followup: MachineOwner

As per Carrona.org, STOP 0x000000D1: DRIVER_IRQL_NOT_LESS_OR_EQUAL | Usual causes: Device driver

Let us see what can we get there.

► Nvidia Display driver.

Code:

lmvm nvlddmkm
start             end                 module name
fffff880`130da000 fffff880`13df8000   nvlddmkm T (no symbols)           
    Loaded symbol image file: nvlddmkm.sys
    Image path: \SystemRoot\system32\DRIVERS\nvlddmkm.sys
    Image name: nvlddmkm.sys
    Timestamp:        Fri Feb 10 07:32:58 2012 (4F347AD2)
    CheckSum:         00D075A7
    ImageSize:        00D1E000
    Translations:     0000.04b0 0000.04e4 0409.04b0 0409.04e4

Update it.

• Download and install Driver Fusion.
• Reboot the computer in Advanced Boot Options, safe mode. Search Driver Fusion in your start menu, and remove all components of your nVidia display driver.
• Boot normally now. Go to Drivers - Download NVIDIA Drivers, follow option two to search for the appropriate driver for your system automatically, and install it.

► NETIO.sys and tcpip.sys. For it, update the network driver.
First, download the network card driver from manufactuer's website. Realtek
Then reinstall the driver:

1. Click the Start Button, type "devmgmt.msc" (without quotation marks) in the Start Menu Search box and press Enter.
2. Double click to expand "Network adaptors".
3. Right click your network card and click Uninstall.
4. Check "Delete driver software for this device" check box, click OK.
5. Restart the computer
6. If windows does not auto configure the appropriate drivers at startup, install the downloaded one manually.

► Scan your system for viruses.

• Anti-rootkit utility TDSSKiller
• Windows Defender Offline

► Disable USB selective suspense.
USB Selective Suspend - Turn On or Off

► Still, there is one thing, that is I am not very sure whom to blame right now. It is most probably QuickTime, but still now I dont have enough evidence to blame it directly. So let it be there for the time being.

Do the suggest changes and let us know the results.

Not expecting it to be solved right now, but I have plans what to do in the next steps.
Best of luck :)

Update your network driver.

Code:

Name    [00000007] Realtek RTL8168D/8111D Family PCI-E Gigabit Ethernet NIC (NDIS 6.20)
Driver    c:\windows\system32\drivers\rt64win7.sys (7.2.1125.2008, 183.00 KB (187,392 bytes), 6/10/2009 3:35 PM)

It is caused by NETIO.sys, which cannot be the real cause, but network related, for sure. And, it says that your network driver is very old.

Code:

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*                        Bugcheck Analysis                                    *
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Use !analyze -v to get detailed debugging information.

BugCheck A, {fffff6fc4006e000, 2, 0, fffff80002eb582f}

Probably caused by : NETIO.SYS ( NETIO!RtlCopyMdlToMdlIndirect+1bf )

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

update the network driver.
First, download the network card driver from manufactuer's website, Realtek
Then reinstall the driver:

1. Click the Start Button, type "devmgmt.msc" (without quotation marks) in the Start Menu Search box and press Enter.
2. Double click to expand "Network adaptors".
3. Right click your network card and click Uninstall.
4. Check "Delete driver software for this device" check box, click OK.
5. Restart the computer
6. If windows does not auto configure the appropriate drivers at startup, install the downloaded one manually.

Here is the latest one ...

Code:

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*                                                                             *
*                        Bugcheck Analysis                                    *
*                                                                             *
*******************************************************************************

Use !analyze -v to get detailed debugging information.

BugCheck 50, {fffff6a00afb9208, 0, fffff80002ca3d23, 5}


Could not read faulting driver name
Probably caused by : memory_corruption ( nt!MiDeleteAddressesInWorkingSet+468 )

Followup: MachineOwner
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According to Carrona.Org, STOP 0x00000050: PAGE_FAULT_IN_NONPAGED_AREA
Usual causes: Defective hardware (particularly memory - but not just RAM), Faulty system service, Antivirus, Device driver, NTFS corruption, BIOS

Another one, as you mentioned ...

Code:

*******************************************************************************
*                                                                             *
*                        Bugcheck Analysis                                    *
*                                                                             *
*******************************************************************************

Use !analyze -v to get detailed debugging information.

BugCheck 1A, {41790, fffffa80063921c0, ffff, 0}

Probably caused by : ntkrnlmp.exe ( nt! ?? ::FNODOBFM::`string'+35054 )

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

According to Carrona.org, STOP 0x0000001A: MEMORY_MANAGEMENT
Usual causes: Device driver, memory, kernel

So there are two common probable causes. Let us go for those first.

► RAM - Test with Memtest86+.
Run it for at least eight hours, preferably overnight.

► Driver Verifier - Enable and Disable
Run Driver Verifier for 24 hours or the occurrence of the next crash, whichever is earlier.

► As a safeguard, uninstall Avast, and install the most lightweight, most efficient and crash free AV, Microsoft Security Essentials - Free Antivirus for Windows.

Let us know the results, with subsequent dumps caused by driver verifier.