Ok cool - IDA pro FTW - INVALID_IO_BOOST_STATE is apparently one of the new integrity checking bugchecks in Windows8 to check that drivers are behaving properly.
It occurs when IO-boosting is applied to a thread which then dies before the IO-boosting is yielded, typically as a result of a resource lock being obtained and then released.
Windows7 didn't bother to check for this eventuality, so your buggy driver would have just sat there as a ticking timebomb leaking non-paged memory every now and then and occasionally bugchecking your system. In Windows8 the driver's misdeeds are detected when the thread that owns the lock is torn down.
Thanks for the details. Not a great experience on a clean install especially using all out-of-box certified & signed drivers. I didn't even have a chance to install anything on it before it BSOD'd. I don't think grandma is gonna care whose to blame here. She'll just go buy an iPad.