Installing Iguana under windows is straightforward with the windows installer.
You will:
Download a zip file which you can double click to expand in the explorer
You’ll need to run the setup file as administrator which the operating system will prompt you. Click YES when you see the prompt asking you this.
The installer will open up your web browser and guide you through a series of steps to install Iguana.
A firewall warning may come up - just click Allow access