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Uninstall Spybot and Kaspersky during troubleshooting. (You may install it back if we know they weren't a part of your issue.)
Then update this driver:
Code:
kd> !irp fffffa80104b1570
Irp is active with 4 stacks 3 is current (= 0xfffffa80104b16d0)
No Mdl: No System Buffer: Thread 00000000: Irp stack trace.
cmd flg cl Device File Completion-Context
[ 0, 0] 0 0 00000000 00000000 00000000-00000000
Args: 00000000 00000000 00000000 00000000
[ 0, 0] 0 0 00000000 00000000 00000000-00000000
Args: 00000000 00000000 00000000 00000000
>[ 16, 3] 0 e1 fffffa8009d3d050 00000000 fffff80003720200-fffffa800d4d63c0 Success Error Cancel pending
Unable to load image \SystemRoot\system32\DRIVERS\Rt64win7.sys, Win32 error 0n2
*** WARNING: Unable to verify timestamp for Rt64win7.sys
*** ERROR: Module load completed but symbols could not be loaded for Rt64win7.sys
\Driver\RTL8167 nt!PopSystemIrpCompletion
Args: 00015500 00000000 00000005 00000003
[ 0, 0] 0 0 00000000 00000000 00000000-fffffa800d4d63c0
Args: 00000000 00000000 00000000 00000000
....
kd> lmvm Rt64win7
start end module name
fffff880`05b10000 fffff880`05b77000 Rt64win7 (deferred)
Image path: \SystemRoot\system32\DRIVERS\Rt64win7.sys
Image name: Rt64win7.sys
Timestamp: Wed Dec 29 17:44:36 2010 (4D1B1F24)
CheckSum: 0007497C
ImageSize: 00067000
Translations: 0000.04b0 0000.04e4 0409.04b0 0409.04e4 Click on the Start

► Control Panel ► Programs ► Uninstall a program ► Uninstall everything related to; Realtek and restart the system. Delete remnants of its drivers/older drivers using
Driver Fusion/Sweeper
Link:
Driver Reference Table Quote:
- search Google for the name of the driver
- compare the Google results with what's installed on your system to figure out which device/program it belongs to
- visit the web site of the manufacturer of the hardware/program to get the latest drivers (DON'T use Windows Update or the Update driver function of Device Manager).
- if there are difficulties in locating them, post back with questions and someone will try and help you locate the appropriate program.
- - The most common drivers are listed on this page: Driver Reference
- - Driver manufacturer links are on this page: Drivers and Downloads
Run the System File Checker. It allows the user to scan for and restore corruptions in Windows system files.
- 1. Click on the

2. Type CMD on Search
3. Left click and Run as Administrator
4. Type SFC /scannow
Full tutorial here:
Run Disk Check on your hard disk for file system errors and bad sectors on it:
Free up the start-up, nothing except the antivirus is usually needed.
Go to this link:
Intel® Driver Update Utility check the system for latest updates. Download and install any it finds.
Post back results.