BSOD occurring seemingly randomly.

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Code:

STOP 0x0000007A: KERNEL_DATA_INPAGE_ERROR   
Usual causes:  Memory, Paging file corruption, File system, Hard drive, Cabling, 
Virus infection, Improperly seated cards, BIOS, Bad motherboard, Missing Service 
Pack
BugCheck 7A, {fffff8a006fa9b50, ffffffffc0000185, 135168860, fffff96000161db0}
*** WARNING: Unable to verify timestamp for win32k.sys
*** ERROR: Module load completed but symbols could not be loaded for win32k.sys
Probably caused by : win32k.sys ( win32k+161db0 )

Code:

Start Menu\Programs\AVG	Public:Start Menu\Programs\AVG	Public

AVG is often a cause of BSOD-s, please uninstall it and replace with Microsoft security essentials at least to test.

• AVG | Download tools and utilities

Run these tools and delete anything they find:

• Anti-rootkit utility TDSSKiller

ESET online scanner:

• Free Online Virus Scanner | ESET

Recommended antivirus program for Windows 7 based on stability compared to others:-

• Microsoft Security Essentials - Free Antivirus for Windows
• Microsoft Security Essentials Download | Free Spyware Protection
• Malwarebytes - The Free version
• Good and Free system security combination.

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.

System Optimisers
Please remove the following software

Code:

Start Menu\Programs\AVG PC Tuneup 2011	Public:Start Menu\Programs\AVG PC Tuneup 2011	Public
Start Menu\Programs\AVG PC Tuneup 2011\Utilities	Public:Start Menu\Programs\AVG PC Tuneup 2011\Utilities	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.

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

Run Disk Check on your hard disk for file system errors and bad sectors on it:

• Disk Check

Free up the start-up, nothing except the antivirus is usually needed:

• Startup Programs - Change
• Troubleshoot Application Conflicts by Performing a Clean Startup

Install all updates, including service pack 1:

Code:

Version	6.1.7600 Build 7600

• Learn how to install Windows 7 Service Pack 1 (SP1)

Check for a BIOS update:

Code:

BIOS Version/Date	Hewlett-Packard F.43, 7/9/2009

Let us know the results, good luck :)