A lot (in fact, most) of the files in \Windows\System32 are hard linked to the main SxS (Side-by-Side) repository, which is in \Windows\winsxs. As a result, many tools will show a wrong size, as they count hardlinked files two times, when in fact they do only exist once.
How is the New Driver Update option in Windows Update working out for people on this Build ? For me, it found old versions of Motherboard Drivers that needed updating that I didn't even know about. Chip Set, SMBus, etc.
Not sure if this is a helpful thread, but I got this thread in a general search for this issue. I am getting GSOD restarts, generally, when I log off. When I log back on, I get the "What was happening when your system shut down", or a reasonable facsimile there of. And whatever I had open, has closed. When I go on the internet, EDGE beta asks me if I want to restore the pages that I had opened. I know this is a Preview pre-release, but I want to know where to report this issue, or find out what I can do to help rectify it.