Lpc2000

I'm working with Keil uVision environment using the gcc 3.3.1 compiler
and now I want to switch to gcc 4.0.2 so I downloaded the gnuarm
toolchain for cygwin from the www.gnuarm.org.
With the Keil environment the gnu toolchain was installed in the
c:\cygnus directory of my PC and the path was set for
c:\cygnus\arm-tools\bin;c:\cygnus\bin
I removed the old path, renamed the cygnus directory before installing
the new toolchain.
The installer for the gcc 4.0.2 toolchain created the
c:\Programs\gnuarm directory, put the cygwin dll's in
c:\Programs\gnuarm\bin directory together to the gcc exe tools, and
finally set the path to that directory.
The problem is that opening a command line window (my PC runs
Windows2000) and typing arm-elf-gcc nothing occur: simply a new
command line prompt is displayed.
For other tools all is ok: for example typing arm-elf-ar I get the
help screen for that command.
I'm a newbie but what I'm doing wrong?
Thank you for your help.