This could be due to malware, a couple of my friends experienced similar problems. Consider reinstalling windows from another computer, and transferring it via usb or burning it onto a blanc dvd. But before that, make sure to format the pc, to eliminate the chance of the malware stealing your windows key.
Edit: Actually, if you don't want to format it to save the photos, I suppose you could take the risk but consider using safe mode in that case
I actually just spoke with her mom and luckily she had moved her default photo folder to a synced skydrive folder so luckily there's no worries there. I was hoping to gain a little experience from this but it sounds like I don't have much choice but to reinstall the OS? That seems to be the consensus among everyone else I could find online who had a similar problem. I'll start researching it now but I'm assuming there's a way to reformat the HDD without logging in correct? Just wanted to confirm, thank you very much.