Laptops should only be updated to Win10 when the OEM (Dell, in your case) gives the go ahead and supplies whatever Win10 drivers you might need for your laptop. Obviously, you didn't buy this laptop new, else I'm assuming it would have come with Win10 installed along with whatever drivers you needed. See if you can find a driver on the Dell site.
click this link Download Drivers
Do the Manual select
There are Windows 10 drivers.
I updated my 4 year old laptop to windows 10 with 0 issues. It had W7,And Acer has no W10 drivers listed. Everything works as It did before.
i play Battlefield 4, GTA 5 and league of legends in my dell 15 5547, but GTA gave some lags e freezen when a usin cars, i updated driver from r7 m265 and gta Works perfect in high graphics, but now league of legends have problems in FPS and freezing.