problem when starting the Cubase Elements 9 trial

Hello. I decided to try to put the demo version Cubase Elements 9 trial
gives an error at startup that you want to set the AERO theme
I installed but the problem at the start remained. Again asks to install the theme but it is already activated. What else could it be?

Please view the following support article:

https://www.steinberg.net/nc/en/support/knowledgebase_new/show_details/kb_show/windows-7-error-message-dwm-composition-is-not-running-please-switch-to-an-aero-theme.html

Thank you very much. Helped