With the message from the last post I found a solution on www.cfd-online.com :
Check to make sure the following folders exist
Press your "start" button and type "cmd" (Command Prompt DOS) right click and run as administrator'.
You should have "c:\windows\system32>_" in the black window
Type in the following one after the other and press enter.
Between step 2 and 3, you might have to restart your system OR use the task manager. When you open the task manager, end every process related to ansys (hint: they will usually be at the top and ansys will be visible in the name and/or descripition section Under "processes" tab in the task bar.
Rename v150 from %APPDATA%\ansys\v150 to v150.old (where %APPDATA% is where your APPDATA variable is set to - 'Just type %APPDATA% in the Explorer Address bar' and it will take you there).
Rename .ansys from %TEMP% to old.ansys (same as above, just type: %TEMP% in the address bar)
Run the ProductConfig.exe from C:\Program Files\ANSYSInc\v150\commonfiles\tools\winx64
and configure the application again, by right-clicking the productconfig.exe file and select 'Run as Administrator',
First click on "Add .Net security exception for ANSYS, Inc products"
Secondly click on "configure products" and select everything..
Run the CLIENT ANSLIC_ADMIN Utility > Set license preferences for user... > v150 and make sure that the license options are set correctly here, (license order you want to have and that is showing the features you will use with ANSYS), so that the new preferences file is created.
Check the graphics driver for the card installed on the machine and make sure it is running the latest driver. If not, update the driver.
So now, I have the menubar but the rest is still grey. I tried it on the dummy account and on the normal, there are no differences.
If I press solve I get the following message, so now I think it's a graphic problem: