All your minidumps crash at ati2cqag.dll. This is your video card drivers. They all have a bugcheck of EA.
0x000000EA: THREAD_STUCK_IN_DEVICE_DRIVER
A device driver problem has caused the system to pause indefinitely (hang). Typically, this is caused by a display driver waiting for the video hardware to enter an idle state. This might indicate a hardware problem with the video adapter, or a faulty video driver.
As you can see from the above, this is either a driver problem or a problem with your video card.