You must have the .NET framework version 1.1 installed.  http://msdn.microsoft.com/netframework/downloads/updates/default.aspx

Spiro 2.0

WindowXP users right-click here and select "Save Target As..."(56KB).

This latest version of Spiro is completely new and improved.
It now has:

• draggable handles in the drawing space for changing the spiros
• Improved print function
• Adjustable page size and scroll bars

For version 1.0 of Spiro compatible with PCs without the .NET Framework installed, click here.