chkdsk /f wont run

I tried to run chkdsk /f and the box said it would run the next time I rebooted and if I wanted to do this (Y/N)...I typed in Y and the dash kept flashing after the Y that I typed in. But when I try to close it, it won't close. It tells me that Windows has to complete something or I can end the program. I have tried 10 times and the same thing happens. Windows has not completed whatever it is supposed to be completing after 20 minutes and I always have to exit the program.
What am I doing wrong, and how can I get chkdsk /f to run? (I do leave a space before /f)

 

I have no idea what that is...
I want to know why chkdsk /f won't work...that is what I want to use. I need to know what I am doing wrong! I don't want some thing that I have to try to find somewhere on some website that I have no idea where to find.
Thanks for your suggestion but it does not explain why I can't get chkdsk /f to work...

 

Did you press ENTER after typing the "Y" character?

 

No I did not know enough to press enter...that is why they call me dummy! Thanks very much...
Old as dirt and twice as dumb!!

 

Don't be too hard on yourself. We've all done things like that at some time or another.

All the best!