Stuck At Pulsating Windows Logo

If anyone can give any.

The problem is this. I got a new GPU for my moms computer. She installed it, it worked fine. She played her game for a bit then went to restart the computer and now it wont work. It'll get stuck at the windows logo where it will pulsate but nothing else after (it just keeps doing that).

The only other thing we can besides starting windows normally is doing Windows Start Up Repair. We don't get the option to start in safe mode ( I think. We we supposed to hit F8 while on the windows logo to do that?). When we run Start Up Repair, it goes to Windows with some kind of progress bar that just keeps going and going (it's not really a progress bar, more just to show that it's loading something I guess).

When we try booting Windows from the disc, we get the same two options "Start Windows Normally" and "Start Windows Repair" or or something like that.

The only things we have not tried yet are:

*Letting Start Up Repair go for 15+ minutes (we went for 15 minutes but decided to try other things to fix the issue)
*Taking out the new card and putting in the old card
*Going in to Bios and press F5 to set everything to default
*Resetting Bios (idk how to do this processes but I've reada bit and I can find a guide)

We tried press F8, but that just takes us to the boot menu with a list of devices to boot from. If we try to boot from the device with windows on it, it just gives us the options to start Windows normally or run repair.

For some reason, we just cannot reinstall windows. We set bios to boot from disc, we even try manually booting from disc via the boot menu, but no go. So booting from disc and repairing or something similar is apparently not an option. What could it be?

I am thinking that it is an issue with the hard drive. I don't know. Any thoughts or opinions?

I feel really bad at this point. I wanted to help out and I caused this headache  

Edit: I forgot to mention, I live several hours from her, so I cannot do anything manually myself. Any instructions or tips or whatnot I will have to give over skype.