Found posts on the forum with the same error that I have and did all that you have told to do in those posts. In fact , finished the steps of stopping services, scaling down Oracle , starting services, disabled XSS filter in Explorer 8, configured windows i.e. edited host file, disabled Linux Firewall! After all this, i hit the retry button but its not happening! Same errors are repeating!. md5sum was also ok.
The posts that I referred to are http://handsonerp.com/forum.html?func=view&id=2521&catid=2#2521 & http://handsonerp.com/forum.html?func=view&id=839&catid=2#839.

Error message is the same as displayed. Did the action you have suggested in the 2nd post .