Nova for Windows is completely compatible with Microsoft Windows^® XP.  This includes all images, maps, calculations, windows, and antenna rotator interfaces.

If you receive an error message "Could not initialize hardware interface," you will need to reinstall Nova in order for antenna control to work properly.  This is because the Nova installation program automatically detects the operating system and installs different kernel driver files depending on whether the operating system is NT-based (like Windows NT, Windows 2000, ad Windows XP).