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#21
Driver Verifier will be mostly causing the freezes, since it 'stressing' the drivers, in order to hopefully pinpoint a faulty driver which needs to be either updated or removed. Driver Verifier will produce a BSOD if a driver is found.
You may stop Driver Verifier after 24 hours, and try to keep the computer on as long as possible, if you need to shut down then try and shut down in Windows.