It definitely sounds like a a graphics card problem. My advice would be to go to your computer manufacturer's website and download the video driver that goes with your system. Or if you know the manufacturer of the graphics card, go to their website and download the driver for that specific card.
If that doesn't work, you could try setting your screen to the second highest setting, and see if it works.
I've tried looking on the site and cant find any software downloads. I'm not sure if I'm missing it somewhere. I checked the LG site and looked up my IPS235 screen, but no software was offered besides Adobe and some other file type. no driver updates.
I've tried many settings. The one I have now is fine but when i compare it to my android it still seems a tad stretched.
It may even be that your graphics card can't handle the monitor. An option you could try is to get another graphics card, preferably a newer one, to try out, and see if it can handle the monitor. If it can, then you know the problem is that the graphics card needs updating.
You have Windows 7, yes? I think the process for starting VGA Mode (assuming Windows 7 has it) is to hit F12, or whatever function key the computer tells you, and then I think F8 will get you to the Advanced Options. One of those options should be a VGA Mode (VGA meaning Video). That would revert your screen its lowest settings, hopefully giving you a temporary solution.