@ MrsOldMX, Thanks for the reply.
I was able to get the Windows Key from the BIOS (using RW - Read & Write Utility, But I'm not sure whether it is the Product Key or not. It was a set of Five characters in Five Blocks).
Burned another DVD with the found Key as a PID.txt, installation went on...
I have a HP Pavilion g6-2231tx Notebook which comes with a preinstalled OEM version of Windows 8.
Tried repartitioning the HDD and am facing the same problem as "xovertheyearsx" had faced.
I have downloaded the ISO mentioned by "MrsOldMX", burned the ISO on to a DVD n while installing...