This is actually all sounding depressing to me. Up until now there hasn't been much difference in changing over from Win 98 to Xp to Win 7...this is...is...I can't find the word. At least I have a long time to get over it.
I thought it was depressing too. Microsoft's forcing it down peoples' throats, forcing their computers to download and install it without the owner's consent was a really stinky thing to do, and people are still having problems with Windows 10 deciding to do a Windows update right when they have to use the computer for a presentation, despite how they've scheduled updates.
But if you didn't have trouble going from XP to Windows 7 you may not have much of a problem. I actually had less of a problem learning to use the old Mac OS9 on a 1990's Mac I bought for vintage Mac games than I did getting used to Vista after using XP. So I don't want to minimize the problems anyone might have getting used to the changes, both in the interface and the behavior, between Windows 7 and Windows 10. I think it's important to have something to fall back on, which is why I suggested a second cheapie computer for Internet, or just to learn on while you keep the Windows 7 computer as is.
It turned out just to be a cable having worked loose. The "power" cable. But with my fantastic tech abilities it only took me "hours" to realise it. And by that time, I had swapped the Acer for my spare Hanns one.
It's possible that Windows detected the change in monitors and changed monitor drivers on you. You may have started out with Acer drivers, and Windows switched to Plug 'n Play drivers or even Hanns drivers when you changed the monitor. Anyway, check in Display Settings to see whether Windows 7 is using Acer drivers for the monitor or not.
1. Right click on desktop and select “Personalize”.
Sparkle, I did not have any trouble downloading or starting the Demo of the game, but I could not get it to register to my screen properly, no matter what combination of Full Screen or Wide Screen options I selected. This meant I had two choices: 1) play with the sides of the game cut off (which meant I could not see the arrows that you select to do the game's side-scrolling and I barely had enough of a fragment of the MENU button to click on it to Exit) or 2) play with a small window that was centered on my monitor but was less than the size of a sheet of notebook paper.
I did enjoy the game's content, but didn't buy it, since it wasn't viable either way.