Hi Nevine.,
As per ur note, I guess ur WebSphere_Portal not started.
thats y
http://localhost:9091/admin not up, What we can do start the WebSphre_Portal --> cd to WebSphere/AppServer/bin on cmd line
startServer.bat WebSphere_Portal, then Portal Admin console up
Regarding this , if u can get any results please let me know,letus work out
Thanks
Venkat