Hello Sunny,
Thank you for choosing Windows and thanks for providing us an opportunity to assist you.
As per the description provided, it looks like you are having issues with Error code 0x8004242 while Installing Windows 8.
The error 0x8004242 translates to "CRC Error" which means that the files that are being copied from the disk are not making it to the hard drive with the same structure, meaning that the "original" files on the disk are being modified/changed/corrupted while being copied to the "destination" location on your hard drive during the install.
This usually means either a bad DVD, or a read error on the DVD drive.
I would suggest you to create a bootable USB(Universal Serial Bus) discand install Windows 8 with the newly created bootable USB.
Reply to us if you face any issues with Windows Installation or any other Windows Issue, and I would be glad to assist you.
Regards,