Give your Pi a short host name by editing /etc/hostname. (I number my hosts.)
Then in Putty I use that short host name for your pi instead of an IP.
WINS will automatically connect to the proper IP. I open Putty and enter [host name] and connect.
If you are logged in on your Windows system as user pi, use win+r and enter ssh [host name] otherwise use win+r and enter pi@[hostname].