Win7 64Bit Wont Boot. Restarts after balls morph into windows logo.

Hey Guys, I'm new here so apologies if i'm posting in the wrong forum ! BSOD doesn't seem appropriate for my issue. So I've got an issue booting my PC which I've been trying to resolve now for over two weeks. I believe its the Win 7 Drive Reassign Issue where your C drive becomes your E or F drive and I've been unsuccessful in resolving this issue but im not sure ! I also think it could be the GPU. I've gone through multiple different solutions I've found in online tutorials on how to resolve the issue but none have worked so far. I've used DISKPART to verify and make active the correct drive but it hasn't worked. I've also tried /bootfix etc and they haven't worked either. It doesn't seem to save the changes i make and when it restarts the c drive is no longer the boot drive so i go round in circles. I'm not 'currently' at my PC so cant be more precise but will take my laptop home to my PC in due course to problem solve this issue with you all. I hope you can help. I have Win 7 64 Bit, 4 Gb DDR2 RAM, Intel Q6600 CPU, Asus R9 270 GPU, Asus P5Q-E Motherboard which annoyingly hasn't got on-board VDA/DVI/HDMI so i cant test to see if its my GPU that's the problem !!!! I mention this as I can load into Windows repair fine ! which is low resolution but when booting into windows it resets as its about to change into the higher resolution used on the login screen ! Coincidence or not ? I don't manage to get to the login screen though. It just restarts. My GPU is 16x 2.0 PCI-E compliant and was working fine but ive no other PC to test it on nor another PCI-E GPU to test in my PC so :/ Yea its going to be an awkward one :/ Sorry. Hope you can help.

Umm well i cant get into windows so unless i can launch a DOS version of DiskManagement then i'm guessing not ! What does the 'Elevated CMD Prompt' do and how do i use it ? I will take a photo of the DISKPART display if that's of help ?

OK So this is what i get.

OK so i have downloaded Rufus, the 17514x64v14.iso and have a 8Gb USB stick. Not sure what to do now ! When i run Rufus i cant select the iso to use so im missing something. Am looking into it but pointers are appreciated rather than wade through readmes or utube tuts.

I don't think you have a UEFI BIOS so lets make the 17514x64 Legacy-MBR boot able.
Extract all files and folders from 17514x64v14.iso to a USB flash drive. (I suggest to use 7zip to extract all files and folders from the iso file to the USB flash disk).
Open a CMD window as administrator and type:
diskpart
list volume (take note of the volume number (n) of your USB flash disk)
select volume n (n is the volume number fond with list volume)
active
exit

Boot from the SIW2 tool.