PuTTY is a popular SSH client on Windows. SSH accepts a username using which it can auto-login, thus saving you the hassle of having to type it in every time. This can be configured in PuTTY easily.
Choose the session you want to configure and click Load. Go to Connection → Data and enter the username you want to use in Auto-login username. Save the session.
Tried with: PuTTY 0.62