Cubase LE AI 7 on Windows 10 doesn`t open anymore

It has been performing for years without problems, except once having to re- register due to problem with the e-licenser. Suddenly a message shows up instead of startup, asking to save my work and to contact Steinberg (havent printscreened the message which I only saw once). Since then, Cubase doesnt start at all. I have only tried running as an administrator without any response.