Hi
I'm glad you were able to start the computer.
First of all stop any trying to start system before hdd clone. The most important is to save current status of HDD. In this way you can start Windows from him.
As far as I know you do not have installation discs. I mean Windows OS and KSS instalation disks. Therefore You need to clone HDD. You can clone HDD on every IDE HDD if you have one, even old HDD but whitout sectors errors. For future purposes you can buy new SSD.
Start system whith the cloned HDD. If KSS does not start, reinstall KSS from "D" partition over current instalation on partition "C:" Du not delete current installation.
To start reinstallation proccess while Windos starts, press SHIFT KEY to stop starting of KSS.
Start windows explorer, go to d: and find KSS instalation folder.
Reinstall KSS
I hope the system starts without errors, but if problems still occur, we will look for a solution. As I have already shared, I have no experience with KUKA ROBOTS, I am currently studying, and if I am wrong, I hope the experienced guys from the forum will share better solutions.
Even you current HDD is not damaged, making a new one (as spare HDD) is good for the future.