Hi,
All of the minidumps have the same symptom and it crashes with bugcheck code FE (ie BUGCODE_USB_DRIVER) and instruction address. Usually it is related to hardware or USB device driver. Probably it is related to the USB driver or the firmware of the BIOS. What USB device trigger the crash?
Mini121506-02.dmp BugCheck FE, {5, 86c6e0e0, 10330035, 86bab180}
Owning Process 86adbda0 Image: svchost.exe
Probably caused by : usbohci.sys ( usbohci!OHCI_PollAsyncEndpoint+41 )