BSOD watching videos and/or useing firefox

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Please remove Avira with its Removal tool: Avira AntiVir Removal Tool - Download

Microsoft Security Essentials.

Recommended from a strict BSOD perspective, compatibility & stability compared to other antiviruses/internet security software. It is free and lightweight:-

• Microsoft Security Essentials - Free Antivirus for Windows
  
  • Malwarebytes : Malwarebytes Anti-Malware removes malware including viruses, spyware, worms and trojans, plus it protects your computer
    
    • Good and Free system security combination.
    • How to Scan Your Computer With Multiple Antivirus Programs - How-To Geek
    
    
  
  

   Warning

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.

Code:

athrx
start             end                 module name
fffff880`04cf9000 fffff880`04fad000   athrx    T (no symbols)           
    Loaded symbol image file: athrx.sys
    Image path: \SystemRoot\system32\DRIVERS\athrx.sys
    Image name: athrx.sys
    Timestamp:        Wed Jan 11 10:47:50 2012 (4F0D1476)
    CheckSum:         002B8FEC
    ImageSize:        002B4000
    Translations:     0000.04b0 0000.04e4 0409.04b0 0409.04e4

Sometimes drivers remain, not completely uninstalled. Follow this tutorial for complete removal of drivers of the particular program:

• How to Clean Left Over Driver Files with Driver Sweeper

If its wireless, match your device from here:

• ATHEROS Wireless drivers for Windows

If its not a wireless, match your device from here:

• ATHEROS Network drivers for Windows

Go to this link: Intel® Driver Update Utility check the system for latest updates.

Download and install them one by one.

Perform a System File Check to check the integrity of all protected Windows 7 :

1. Click on the start
2. Type CMD on Search
3. Left click and Run as Administrator
4. Type SFC /scannow

Full tutorial here:

• SFC /Scannow Command - System File Checker

Disk Check on your hard drive for file system errors and bad sectors on it.

• How to run Disk Check on Windows 7

# make sure you are not running out of Hard drive space.

Reduce items at start-up. Nothing except anti-virus is required plus improves the time for logging in windows.

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

Let us know the results.

Look forward to your results.

Thanks for letting us know.

Safe surfing :)