I read about fixing the resolution to be full screen and all, but is there a way to remove the black box that surrounds the actual gameplay?
Edit:With Nvidia Cpanel.
Try going to Display->Adjust desktop size and position. There should be a section that reads
2. When using a resolution lower than my display's native resolution
Set the option to either "Use NVIDIA scaling" or "Use NVIDIA scaling with fixed-aspect ratio".
You may need to change something in the dosbox configuration file as well, but I think this should be enough.