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  • Good call. I have the following in the event viewer: "The file system structure on the disk is corrupt and unusable. Please run the chkdsk utility on the volume OS." (Event ID 55) Still not sure why it's happening, though.
    – tghw
    Commented Apr 27, 2011 at 12:24
  • If Windows is interrupted while it's updating things on the disk that it uses to look up files and find free space, like MFT records, then you might get things about chkdsk on reboot. See my edit above for more information as well.
    – LawrenceC
    Commented Apr 27, 2011 at 15:18
  • Taking into account 'couple weeks of uptime', I guess some I/O or filter driver might be failing and getting unloaded; maybe the DMA HDD access is reverted to one of the PIO modes - which could explain the very slow shutdown. I'm not sure Windows-7 was initially designed for 'couple weeks of uptime'.
    – chronos
    Commented Apr 30, 2011 at 23:20