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There are various stop codes can be seen from the dumps which are generally caused by memory issues. However in more than one dump, Nvidia display driver can be seen in the raw call stack. So let us address the possible driver issues first. Please follow the below steps.
Clean install Nvidia driver.
Latest version of Nvidia driver is known to be buggy, especially on 7 series card. Your current version is a beta one.Please uninstall it and use a WHQL version for testing.
1. Uninstall the graphics card driver completely from Control Panel --> Programs first. While uninstalling, remove the components like Nvidia update, 3D vision , Physx etc first and graphics driver at last.
2. Now download and install the below version.
While installing. choose custom and unselect everything except display driver and Physx.
AVG may cause BSOD issues in some systems. Please uninstall it completely and use free Microsoft Security Essentials as the main antivirus.
Uninstall Daemon tools.
Kernel mode drivers used by this program is famous for erratic behavior on Windows 7. Uninstall it as a test until the issue is resolved.
Report how the system works in next reply.