I can't open my UE4

it says something of my computer (maybe is a grapic card)'s level is too low,however,after i upgrade my grapic card,it still shows the same warning.My computer is x64 and windows 10,how can i deal with this?

What’s you video card, processor and how much RAM does your PC have?

it says something[…]

What is the exact message you’re getting?

video card’s level is 9,RAM is 4 GB,and i can’t remember the processor

We can’t help you if you don’t give us information. When you get a chance, copy paste the error message into a response.
Also, by video card, we mean what actual video card do you have (ex: gtx 1060)