I was having slightly different but similar issues (benchmark would launch and instantly crash) and managed to fix it. I knew my laptop wasn't the best but I was certain it should at least be able to open!!

(for those with nvidia graphics cards)
By checking device manager it said my nvidia driver was up to date and had no updates. I had nvidia geforce experience installed, checked that too, I had previously installed some version of the 'GeForce Game Ready Driver,' and the application said there was a new version of that to download. However every time I tried to install that it said it failed. Figured the application itself might've been outdated so I uninstalled geforce experience and reinstalled it. I was then able to download the newer game ready driver, and from there the dawntrail benchmark launched perfectly!

I suspect my old 'game ready' driver had compatibility issues with the benchmark.