Scource path too long?

When tryin to exteact a cropreesed file that I have downloaded, i am getting a message saying 'The scource file name is larger than is supported by the file system. Try moving to a location wich has a shorter path name or renaming to shorter name before attempting this operation'
This has got me really confused! I have tried searching Windows help and other threads here but cant find anything. Im using Vista.

Any help would be greatly appreciated