Cant install Cygwin

[Dumb & Dumber]

Dear All,
I installed Cygwin on Windows Xp SP2. During install to select some packages 
like; apache postgresql and download from net. I installed cygwin to 
D:\cygwin. There was no error until installation finish but when I run 
cygwin.bat.
It shown propmt but can't run any command.

bash-2.05b$ who
bash: who: command not found
bash-2.05b$ ps
bash: ps: command not found
bash-2.05b$ ls
bash: ls: command not found
bash-2.05b$ df -h
bash: df: command not found
bash-2.05b$ uname -a
bash: uname: command not found
bash-2.05b$

Any idea?

Best Regards
JJ

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