Fedora 17 - Logging in after selecting source kicks me out to the login screen

Hi Gurus,

This is Vivek, iam very new to linux desktop environments. I have been using Fedora 17 for my official work from the last couple of months and i feel this to be very light on applications and fast when compared to Windows.

Ok, now the problem is I was trying to have the feel and look of Mac OSX Lion theme on my existing Fedora 17 desktop. I have installed the required rpm "fedoramd-release-17.rpm" and rebooted the machine. Now, i have the new option on the login screen to select from source i.e., 'enligtenment' and 'gnome'. When i select enligtenment and supply my login credentials n hit go, this kicks me back to the login screen again. This is not letting me what i wish to desire.

Please help me, if iam missing anything here.

Steps done:

shell> su -c 'rpm -Uvh http://repo.fedora.md/fmd/fedora/fed...release-17.rpm'
shell> su -c 'yum install enlightenment exchange'

My Machine details:

Gnome version 3.4.2
Fedorar 17
Memory: 8gig
Processor: Intel® Core™ i5 CPU M 560 @ 2.67GHz × 4
Graphics: Intel® Ironlake Mobile
OS type: 64 bit
Disk: 320 gig