OK, so I've had Windows 8 installed on my 500GB Western Digital USB 3.0 Hard Drive for a month and a half, ran it on multiple different machines, (Two of my laptops; a HP Pavilion dv5000 and a Gateway NV52; my university's HP Compaq 6000 Pro AIO machines (3 of them so far); and my friend's Acer Aspire one) and its worked great until this afternoon. I see it start up to the Win8 Boot screen and then i get the new blue screen with the error code "0xC000021A". I have also tried to get the Options menu to display on on the win8 boot loader and even then i still get the error message. I've only seen this on the AIO machines, I have yet to attempt to try it on my laptops. I guess I can't really provide any more info, except that it was fully updated, had office 2010 installed on it, and it also had connectify installed.