New GPU for Dim E520?

This modest Dell PC hasn't missed a beat. It has an Nvidia GeForce 7300LE graphics card feeding a pair of AOC monitors, and being no gamer/having no teenagers, I use it for i/net stuff and correspondence.

But now I want to connect to a new fibre b/b facility, and do streaming movies and TV. The Win 10 gadget belatedly tells me this GPU cannot run the latest OS ''cos Nvidia haven't sorted out a driver.

But I still want to upgrade my GPU.

So, good Dell forumeers, what graphics card will fit inside without pushing something else out the way - AND do the job?