Use mIRC for Windows if you prefer. It's the most widely used one:
www.mirc.comYou can always switch to a different client later on if you prefer
If you really run into problems, look me up on EfNet, Rizon, IRCHighway, DANet or EnterTheGame. I'm using the same nick as I use on these forums, and unlike Nabiki these networks are listed in the first connections window you run into.
If that fails... send me a PM, and we'll see what we can do