[Rehan]

@Rehan

Well, before wiping the existing Windows 8 installation I would suggest to take a 1:1 copy of the disk with something like Clonezilla (free and open source) or Acronis True Image (paid and closed source). In that way you can restore his previous Windows 8 installation if wiping it didn't solve the issue with Windows 7 installer freezing up.

If the mainboard has secure boot and EFI/UEFI make sure you a) disable secure boot and b) set the EFI/UEFI to legacy mode. Windows 7 is from times before EFI/UEFI and secure boot.

Oh my lord.I am tired of this     
I have tried all of these methods but still hanging on same place.

1-Re-creating Bootable USB Drive twice
2-Formatting The Already Installed Windows, I formatted the Drive C and also i purged the System Reserved Drive.
3-I enabled the lagacy boot and disabled with changing the RAID and IDE

RAID nd Legacy Enabled | RAID and Legacy Disabled
IDE nd Legacy Enabled | IDE and Legacy Disabled


But still hanging on same place.


Now i am tired too much.Now i don't have much energy to waste on it.I want to cry hard.But still i have 1 method left.But for today its enough. i can not waste more time on it.
Tomorrow i shall make a bootable usb of Windows XP and format the drive C and Delete the System Reserved Partition.( old method of my father to solve most of these type of problem )
But what if i failed again after deleting the exiting partition and system reserved partition?Windows XP will change it to 100MB while it is 350 MB now.