BSOD while browsing or playing video

Different errors:
KERNEL_MODE_EXCEPTION_NOT_HANDLED
PFN_LIST_CORRUPT
NTFS_FILE_SYSTEM
SYSTEM_THREAD_EXCEPTION_NOT_HANDLED_M

This is Win 7, 32bit.
Machine is 6 months old, OS was re-installed 3-4 months ago.
It was crashing before, but more often recently...

Reports attached.

Thank you!

Software Concerns:

I note that you only have four Windows updates installed. Please install all Windows updates.

• Update to Service Pack 1 (SP1)
  
  Download Details - Microsoft Download Center - System Update Readiness Tool for Windows 7 (KB947821) [August 2011]
  
  Download Details - Microsoft Download Center - System Update Readiness Tool for Windows 7 for x64-based Systems (KB947821) [August 2011]
  
  Steps to follow before you install Windows 7 Service Pack 1 from the Microsoft Download Center
  
  Service Pack 1 Download site

Analysis:

Your crashes have a variety of BugCheck codes. This typically indicates a hardware concern; some of your crashes even blame hardware directly. Run some hardware checks.

• If you are overclocking any hardware, please stop.
  
  
• If you have an SSD, make sure the following are up to date:
  • SSD firmware
  • BIOS Version
  • Chipset Drivers
  • Hard disk controller drivers/SATA drivers
  • If you have a Marvell IDE ATA/ATAPI device, make sure the drivers are up to date from the Intel site or Marvell site and not from your motherboard/vendor support site.
  
  
  
• Run all but the advanced tests with SeaTools for HDDs.
  SeaTools for Windows
  
  SeaTools for DOS
  
  
• Monitor temperatures during the following tests.
  
  Use the following programs to monitor the temperatures.
  • Real Temp is a good CPU temperature monitor.
  • Speccy - System Information - Free Download will monitor all hardware temperatures.
  • HWiNFO, HWiNFO32 & HWiNFO64 - Hardware Information and Analysis Tools can be inaccurate for CPU temperatures, but is a good program for GPU temperature monitoring.
  
  
  • Use FurMark: VGA Stress Test, Graphics Card and GPU Stability Test, Burn-in Test, OpenGL Benchmark and GPU Temperature | oZone3D.Net to test the graphics card GPU. Let it run until the GPU temperatures even out or until the GPU temperatures reach a dangerous level (you can find the max temperature for your card on either the nVidia or AMD sites; if you are not sure, ask us). The goal is to get a steady temperature, find out if the GPU is overheating, or to see if there are any artifacts present in the test itself: look for strange pixelated patterns on the screen or colors that do not look like they belong. Then use the |MG| Video Memory Stress Test 1.7.116 Download to test your graphics card memory. Let the memory test run for at least seven passes; the more the better.
    
    
  • Run Hardware - Stress Test With Prime95 to determine any hardware problems. Run all three tests for a few hours each. If you get errors, stop the test and post back here.
    
    
  • Follow the steps for doing CPU stress test using IntelBurnTest
  
  
• Run the boot version of Memtest86+ paying close attention to Parts 2 and 3 of the tutorial. Also, in case Memtest86+ misses anything and comes up with no errors, run the extended version of the Windows Memory Diagnostics Tool for at least five passes. These you may want to run overnight since they take a long time to complete (run them an hour before bed each of the next two nights and check before going to sleep that they are still running).
  
  
     Warning

  Before you proceed with the following, answer these two questions: Are you still under warranty? Does your warranty allow you to open up the machine to check hardware? If you are unsure of the answers to these questions, contact your system manufacturer. WARNING: The steps that follow can void your warranty!!!
  
  
  For Part 3: If You Have Errors: If you swap any memory components, follow these steps for ESD safety:
  
  1. Shut down and turn off your computer.
  2. Unplug all power supplies to the computer (AC Power then battery for laptops, AC power for desktops)
  3. Hold down the power button for 30 seconds to close the circuit and ensure all power drains from components.
  4. Make sure you are grounded by using proper grounding techniques, i.e. work on an anti-static workbench, anti-static desk, or an anti-static pad. Hold something metallic while touching it to the anti-static surface, or use an anti-static wristband to attach to the anti-static material while working. If you do not have an anti-static workbench, desk, or pad, you can use your computer tower/case by finding a metal hold in it, such as a drive bay.
  
  Once these steps have been followed, it is safe to remove and replace components within your computer.

Sorry for replying a little late... it took me some time to find bootable media for Memtest86+, and finally had to wait a week to confirm the system is really stable.
Yep, the problem was in the memory and Memtest86+ is an awesome tool!
I removed one module and things started working normally!

writhziden, thanks for your help as well!