Serious install problems. Album to produce.
You should use your old Cubase v 5 until you have got used to the new version before you finish all present work.
As to your problems. Have you no friends in the music business in your town or country? Because a software forum is not the place to fix your studio. Like you wouldn’t fix your car by email.
You need hands on. As well as Steinberg support.
BTW your system looks like it should be ok easily.