Dear sir/madam,
             I have installed cygwin 3.3 from the cygwin.com (given install
from internet option) for windows 7 32-bit system. I have followed the
instructions to install. after installing cygwin I tried to install ns2 in
the cygwin command prompt. I received the error as *gcc* not found. Again i
tried to install but i couldnt fint the gcc package in the list. how to
rectify it?

In other system I have installed it through install from local directory
option(dowloaded packages priorly). I got a successful in installation. I
have executed the .tcl file in xwin and got the output and properly exited
the windows. After sometime I came to execute other .tcl program but i got
an error when i give *startxwin * in the cygwin prompt. the error is*
"startxwin: Resource temporarily unavailable. Another X server instance is
running at DISPLAY:0"*. How to rectify this error.

Installed in windows 10 system but I got an error as Server unavailable.how
to rectify this.

do the needful as soon as possible.