Hi! Could you please upload your crash logs (if there are any) found under "Documents/Paradox Interactive/Victoria 3/crashes" as well as a DxDiag file (Start Menu->DxDiag->Save all information)?
In the meantime you can also try purging the shader cache (deleting the Documents/Paradox Interactive/Victoria 3 folder after backing up your saves) and trying to launch the game again.
In the meantime you can also try purging the shader cache (deleting the Documents/Paradox Interactive/Victoria 3 folder after backing up your saves) and trying to launch the game again.