You changed MB's recommend a reinstall of OS.
.. Have you turned of Hibernation ( Uses space = to ram, for You thats 8 gigs)
.. Have you set page file min/max to the same value, 1024 mbs (will save about 11 gigs)
.. Disable restore points, Or limit the space they can use - Over time this space can get hugh.
If you had Hibernation on and turn it off, or turn off (or Limit space) for restore points, reboot and run disk cleanup.