Hi Katana DV20,
This is Makarand P from Dell Technical support. Looking at the problem, it certainly looks like the Windows 7 operating system is corrupted. So the only option you have is to re-install the Windows 7 through a disk, wherein, do not re-format (you would be performing a parallel installation of operating system). Once it boots up and you are able to log onto windows, if there is anything else to back up, back it up on an external hard drive and re-install the windows 7 but after reformatting the hard drive. This would ensure a clean installation of windows 7. Also ensuring the problem doesn't happen again, hence a clean installation is required. Does sound like a lot of work but that's the only way forward.
Kindly revert back for any further clarifications.
Dell- Makarand P
Dell Social Media and Communities Professional.