you need to be root to edit that file.
also are you on a LAN, or are you trying to come in via the WAN from the MS Windows computer to the Linux computer.
On Linux install ssh and sshd, run sshd. the daemon, NOT ssh the client. just because you can ssh out does not mean you can ssh in to the same Linux computer.
as Mint is a clone of Debian you can use apt-get to search:
# apt-get search ssh*
then as root ensure it is running:
# /etc/init.d/sshd start
double check that is the correct path/code for Mint, sorry im RH guy.
Once that is up and running verify that in your /etc/hosts you have the LAN IPscheme if you are on a LAN.
# vi /etc/hosts
or something to that effect. restart ipfilter, then attempt to connect.