Here is a list of IRC clients you can use to connect to IRC. If you're new you might want to try the Java client. mIRC is the recommended client for Windows users, but feel free to use the one that you feel most comfortable with as they all can be used to connect to #mahq.

Windows Clients

mIRC
dIRC
Klient
Leafchat
pIRCh
vIRC
WiRC
XiRCON