Updated nvidia drivers, both realtek things, and uninstalled VAC.
Now running chkdsk (on a separate computer at the moment), and it's taking quite a while... remember last time it was nearly instant. This time it's on 26% of verifying > 200,000,000 free clusters. =/ 1TB harddrive supposed to take this long?
EDIT: attached pic. sry for resolution, took with phone