thank you for your answer. I tried to install Windows 8.1 after the failed Windows 10 Update, but it now fails with the same failure messages. Sometimes the clean installation of windows 8.1 goes trough after 8 or 9 trys from USB Stick, but then it always fails at installing updates and as mentioned above the programms are not working correctly and always crash after a few minutes.
Different memory testing softwares (some from windows itself, but also a linux based one) are sometimes telling me the RAM is broken and sometimes work without any failures.
I am not sure how I could solve the problem, if the RAM actually isn't broken.
The website from fujitsu support for my model says, its supporting windows 10
. Thats why I tried to update.
Is there any partner neer Münster, Germany where I could bring my Laptop in for it to be tested if the hardware is broken?