Hi, I am trying to install FSL using cygwin and Windows XP. Cygwin was installed smoothly (it didn't give me any error messages one the way and I got Installation complete message at the end). I am now following the instructions to install FSL. But when I try to put tar xvfz fsl-*.tar.gz in the Cygwin terminal, it says tar: command not found. Why? It says the same thing when I put ls. Does that mean Cygwin installation was not successful or there's a problem with something else? Thank you for your help! Ryoko