Okidoki ... then you need to continue from here
CHKNTFS /X f:
The X tells Windows to NOT check that particular drive on the next reboot. At this time, manually reboot your computer, it should not do a Chkdsk and take you directly to Windows.
Once Windows has fully loaded, bring up another CMD prompt and type and now you want to do a Chkdsk manually by typing
Chkdsk /f /r f:
This should take you through 5 stages of the scan and will unset that dirty bit. this takes a while so be patient. Finally, type
fsutil dirty query f:
and Windows will confirm that the dirty bit is not set on that drive. It will give you this message:
Volume - f: is NOT Dirty
From here we are back to some sense of normality ....