Crash caused by your Realtek network driver
. You have the latest driver so I would like for you to download the driver from here - Realtek
Uninstall the network device from device manager and make sure to choose the option to remove driver software.
Reboot the computer and install the latest you just downloaded and see if that fixes the problem BSOD BUGCHECK SUMMARY
Built by: 7601.17713.x86fre.win7sp1_gdr.111025-1505
Debug session time: Mon Feb 20 10:34:46.592 2012 (UTC - 5:00)
System Uptime: 1 days 21:27:41.934
*** ERROR: Module load completed but symbols could not be loaded for tcpip.sys
*** WARNING: Unable to verify timestamp for Rt86win7.sys
*** ERROR: Module load completed but symbols could not be loaded for Rt86win7.sys
Probably caused by : tcpip.sys ( tcpip+62b7f )
BiosReleaseDate = 09/24/2009
SystemManufacturer = System manufacturer
SystemProductName = System Product Name
CPUID: "Intel(R) Core(TM) i5 CPU 750 @ 2.67GHz"