Also, are you sure that the driver is installing properly? I'm also wondering if it's the Intel GMA driver you should be installing. The other one was working for people on Windows 10 just to get their system working, but I don't know for a fact that it was also giving them OpenGL 2.1 functionality as well. I suggest trying the GMA driver (https://downloads.dell.com/FOLDER01284336M/1/Video_Driver_W33X5_WN_8.15.10.2993_...), and make sure that it's actually installing by going back into Device Manager and checking out the driver tab on your Intel display adapter's properties dialog box. You should be able to right-click the "My Computer" icon on the desktop and click 'Properties' there to get to a system control panel screen - where there is a 'Device Manager' link on the top left.
It's important that you make sure the driver is actually being used by the graphics hardware, because installing the wrong driver will cause it to automatically revert to one that worked previously.