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How old are the hard drives?
You should test them:
Hard Drive Diagnostic Procedure
Upload a screenshot of your hard disk using crystal disk info:
Please uninstall Zone Alarm as it's contributing in your crashes. Use Microsoft Security Essentials while troubleshooting:
Code:
STOP 0x00000050: PAGE_FAULT_IN_NONPAGED_AREA
Usual causes: Defective hardware (particularly memory - but not just RAM),
Faulty system service, Antivirus, Device driver, NTFS corruption, BIOS
BugCheck 50, {fffff8e0035d59bc, 1, fffff80003bc7fa2, 5}
*** WARNING: Unable to verify timestamp for vsdatant.sys
*** ERROR: Module load completed but symbols could not be loaded for vsdatant.sys
Could not read faulting driver name
Probably caused by : vsdatant.sys ( vsdatant+485f0 )
==================================================================
STOP 0x00000050: PAGE_FAULT_IN_NONPAGED_AREA
Usual causes: Defective hardware (particularly memory - but not just RAM),
Faulty system service, Antivirus, Device driver, NTFS corruption, BIOS
BugCheck 50, {fffff80000000600, 0, fffff80003a7befa, 0}
Could not read faulting driver name
Probably caused by : ks.sys ( ks!KsProbeStreamIrp+97 ) Recommended antivirus program for Windows 7 based on stability compared to others:-

Do not start the free trial of Malware Bytes; remember to deselect that option when prompted.
Run a full scan with both (separately) once downloaded, installed and updated.
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:
- Click on the

- Type CMD on Search
- Left click and Run as Administrator
- Type SFC /scannow
Full tutorial here:
Run Disk Check on your hard disk for file system errors and bad sectors on it:
Reinstall your graphic card drivers. Click on the Start

► Control Panel ► Programs ► Uninstall a program ► Uninstall everything related to; ATI. (Reboot the computer if required). Delete remnants of its drivers/older drivers using
Driver Fusion/Sweeper
Get the latest drivers from the link below. (Choose custom install, avoid CCC - Catalyst Control Center during installation.)
Free up the start-up, nothing except the antivirus is usually needed.
System Optimisers
Please remove the following software:
Code:
Start Menu\Programs\Advanced SystemCare 6 Public:Start Menu\Programs\Advanced SystemCare 6 Public
This software is a known cause of BSOD's. The windows 7 operating system does not require these registry cleaning software. They often tune-down rather than tune-up and can wreck the OS beyond repair. Microsoft have improved Windows 7 significantly and it is much better at organising and optimising itself than its predecessors. Check
this,
this and
this thread for evidence.
If you feel the need to use a registry cleaning or optimisation software, most of us recommend the use of
CCleaner but make sure you back up the registry before making letting ccleaner delete anything.
Check for a newer version on the BIOS:
Code:
BIOS Version/Date American Megatrends Inc. 080015, 11/03/2010
Let us know the results and further BSOD-s if any.