Factory Image for Recovery not working

Greetings!

This evening I tried to reset my Windows Installation because it became sluggish.

I am running Windows 7 Home Office on a Dell XPS 17 l702x. The Laptop has seen a faulty Windows Installation a few years back (¬3) which I managed to mostly override with a Factory Recovery.

The Recovery Partition and the Hidden Partition are untouched. Yet I still get a small glimpse of the Laptop offering me two distinct windows installations during booting from which to choose. Both of which shouldn't exist anymore.

I have already tried:

1. Restoring it via suggested booting up of the recovery portion.

That did not yield any result. No matter how often I tap F8 during boot, there's no advanced boot options and thus no option for me to simply repair my computer.

2. Restoring it via Datasafe Local Backup

The option to restore the factory settings is simply greyed out. The program doesn't appear to do anything.

2.a) Restoring it via Dell Backup and Recovery

The program prompts me to deinstall Datasafe first. When I try to do this I get a colorful error message: "InstallScript Setup Launcher Unicode has stopped working".

3. Manually restoring via the original factory image I kept separate USB Stick.

The image is the one from my recovery partition, the exact same one I used years ago. When I slot it in and try to boot from there it just says "invalid partition table". The PC refuses to work, unless I restart without the USB.

Also I don't seem to be able to boot the dos or the advanced settings to manually reinstall windows.

Slowly I am losing my mind. :/ This has kept me up for 4 Hours now and I only wanted to set back Windows because the Laptop was getting slower and spewing randomly named orders everywhere that I couldn't delete.

And I don't know what else I could try.