I've been encountering an issue with an error message that states, "NTVDM CPU has encountered an illegal instruction" while trying to run an old 16-bit application on my Windows 7 machine. This mainly happens when I try to start or run the application, and it just halts the operation. I've tried a few basic troubleshooting steps, like running in compatibility mode, but nothing seems to solve the problem. Does anyone have any insights into why this might be happening or how I can resolve it? Would greatly appreciate any tips or solutions from those who might have faced a similar issue!