Couple of thoughts - is there a later driver available for the on board graphics? Also, is it possibly set to 16bit colour instead of 32? (No idea where you'd find that on W10, it's usually in screen/graphics properties though).
A separate graphics card is an obvious solution /upgrade especially if gaming or playing HD video, tomshardware.com has ratings based on price etc, worth a read. Onboard graphics are usually basic compared to proper cards (although a modern one should cope with HD playback ok).