Hi qwertymaster, this crash dump suggests memory corruption so please follow this:
Take the RAM sticks out and clean the contacts with a soft pencil eraser and then blow out the RAM slots with a can of compressed air. Push the sticks back in and out a few times. Test the system for any improvements and then if it still freezes run the PC on one stick at a time while running videos or anything that uses a lot of memory. If the freeze still occurs then swap the sticks so you test each one individually.
Your system is not up to date please switch on Windows Update to get all the latest security releases and patches and bring you system up to Service Pack 1.