This
Code:
Give root password for maintenance
is the first thing to do.
Giving the root (aka admin) passwd will get you into the cmd line. (Ask the orig owner if you don't know the passwd)
Note that nothing appears as you type it in, not even dots or '*'s, for security.
Then type in this cmd
then hit the Enter key and it'll attempt to repair the file system.
You should know that this version is waaay out of date and no longer updated, thus leaving you open to security holes.
I think the latest Fedora is v19.
IF you want to update, you'll have to backup any important data and do a fresh install of the latest.
At this point you obviously have the option of using a different Linux distribution, see
www.distrowatch.com.
You'll find lots of threads here asking what's 'best'. In fact there's no such thing, but for a non-tech person, Linux Mint is very popular at the moment, see the other threads.
Doing a fresh install will also allow you to re-use the disk space currently taken by Windows, thus giving you more space.
HTH