BSOD when computer starts up

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Start by performing a clean boot:

Troubleshoot Application Conflicts by Performing a Clean Startup
Perform a clean startup to determine whether background programs are interfering with your game or program
Perform a clean startup to determine whether background programs are interfering with your game or program

You're welcome.

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.

• Norton Removal Tool

And MBAM for extra security :)

• Microsoft Security Essentials - Free Antivirus for Windows
• Malwarebytes : Malwarebytes Anti-Malware removes malware including viruses, spyware, worms and trojans, plus it protects your computer

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:

• SFC /SCANNOW Command - System File Checker

Hope this helps. Good luck.