Welcome
Your BSoDs were caused by "Symantec Extended File Attributes"
Norton is a known cause to BSoDs, suggest you to uninstall it and all its components right away.
Keep MSE instead. It's free, light weight and does not cause such problems.
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Norton Removal Tool
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Microsoft Security Essentials - Free Antivirus for Windows Code:
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* Bugcheck Analysis *
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Use !analyze -v to get detailed debugging information.
BugCheck 1000007E, {ffffffffc0000005, fffff800021c204b, fffff88002ddc5f8, fffff88002ddbe50}
Probably caused by : SYMEFA64.SYS ( SYMEFA64+12441 )
Followup: MachineOwner Code:
STOP 0x0000007E: SYSTEM_THREAD_EXCEPTION_NOT_HANDLED
Usual causes: Insufficient disk space, Device driver, Video card, BIOS,
Breakpoint with no debugger attached, Hardware incompatibility,
Faulty system service, Memory, 3rd party remote control,
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STOP 0x0000001E: KMODE_EXCEPTION_NOT_HANDLED
Usual causes: Device driver, hardware, System service, compatibility,
Remote control programs, memory, BIOS
Go through these if you have time:
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Malwarebytes - The Free version
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Good and Free system security combination.
Run the System File Checker that scans the integrity of all protected Windows 7 system files and replaces incorrect corrupted, changed/modified, or damaged versions with the correct versions if possible:
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SFC /SCANNOW Command - System File Checker
Free up your start-up, keep nothing except your antivirus:
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Startup Programs - Change
Keep us posted, good luck