Hi there,
I've had a very similar problem with explorer, and mine even stopped working and restarted consecutively until I had to restart my system through the reset button.
I've got a thread started on this forum, and as I don't wish to hijack this thread, I would ask of you both to have a look at it and see if anything strikes similarity or any common factor for our problems with Windows 7 Home premium 64bit.
Thread:
"has stopped working" and BSOD's