Where you able to track down which application was causing the problem?
I would suggest you to uninstall Daemon tools and replace with Magic ISO and uninstall Norton and replace with Microsoft security essentials.
Their often a cause of BSOD-s. Daemon Tools
Please uninstall DAEMON Tools. It uses a driver called sptd.sys which is known to cause BSODs in Windows 7. Uninstall the software using Add/Remove Programs. Reboot the system. Once the program is uninstalled, run sptd.sys uninstaller
to remove the driver from your system.
As an alternative, many people recommend the use of Total Mounter
or Magic ISO
The antivirus you are currently using is known and contributing to your BSOD crashes, consider uninstalling it with the Norton Removal Tool.
And MBAM for extra security
Run the System File Checker that scans the of all protected Windows 7
system files and replaces incorrect corrupted, changed/modified, or damaged versions with the correct versions if possible:
Hope this helps. Good luck.