Apex legends wont launch?

You'll hear about the "change language" trick, the "move directory" trick, and the Repair trick, but fundamentally these are all just rebuilding then re-scanning the game's directory, so these users likely had some file/file path problems to begin with - hence the 'solution'.

No, Onyy, I see by the Core 2 Quad Q9450 in your specs and by the error message that you attached, you are likely encountering incompatibility with SSE instruction sets.

It's your CPU type. Granted, that quad is a bit slow for what Apex needs to begin with, but the inability to get into the game at all -- this is likely your processor/instruction set-related.