I have a dialup connection, and obvioulsy the setup of the enviroment would take ages.  I took my laptop to work, and used the broadband connection to download the files, and it installed the cygwin stuff on the laptop.  I got home, and transferred the install files to my desktop in the same folder,  My Documents/Cygwin Install/...  then I copied C:/cygwin from the laptop over to the desktop, also in c:/cygwin .  I double click the bat file in c:/cygwin, and I get an error "bash.exe: warning: could not find /tmp, please create !"   
Well, I checked , and there is a tmp folder in c:/cygwin already.  Anyone know why it doesnt work ?  It does work on the laptop if that matters.
Any help or suggestions would be greatly appreciated.
Here is a pic of the error, along with the cygwin directory:
