I have the Windows version of Bitcoin-QT installed, which includes Bitcoind in there somewhere, I think. You'll need that and the files killerstorm posted.

Install Bitcoin-QT and then make a file entitled bitcoin.conf in C:\Users\YOURUSERNAME\AppData\Roaming\Bitcoin that contains

server=1
rpcuser=rpcuser
rpcpassword=make your own password

Change the bolded items to your PC username and a password of your choosing.

Then navigate to the Bitcoin-QT folder via commmand line, or shift right click>open command window here in the Bitcoin-QT folder, and then run Bitcoin-QT with the following flags

bitcoin-qt -testnet -txindex -reindex

This should launch the Bitcoin GUI in the green colored testnet mode. Wait until it finishes the reindex.

Then, via command line, navigate to the NGCCC directory that you downloaded and use the following command to configure ngccc to use the testnet

ngccc-cli setval testnet true

Now, you should be able to launch the ngccc GUI by typing

ngccc-gui

I'll be writing up a better guide later this evening, so if this doesn't work for you, stay tuned.