Farhana Aziz Hello
If I understand correctly, the error you were getting earlier regarding graphic card driver is not coming, but now the simulation is not solving.
When you say it is not solving, what exactly is happening? Are you getting any error stating, simulation can not be solved? Or it just hangs and crashes? Or you are not seeing the run button, or the run button is not solving anything, when clicked?
Also I would like to know which version of Discovery you are using, and is it happening with all the simulations or just specific to this topology optimization case? Can you try doing a simple run and see if even that is giving you an error? If it is happening just for the topology run you are doing, then we can rule out the possibility that it is anything to do with the graphic card driver.