error mounting /dev/sdb1 at /media/

1) press ctrl+Alt+t and type following command
2) sudo ntfsfix /dev/sda3
3) press enter
4) Type your password
5) Now you done.
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can't mount or even boot my windows disk after I installed ubuntu.

CREDITS:

https://www.youtube.com/watch?v=OpjVYZLjFm0