Thanks guys! I delayed the start of dosbox by 10 seconds, and it still dropped out, so I gradually increased the time, and when I got to 40 seconds, it worked! So I'll try to work out what other program or process is interfering, but I'm glad to know that it will work.

Hi, I have Windows 7 Home Edition 64-bit, running on a Sony Vaio Pro 13 laptop. processor: intel core i5-4200u Ram: 4gb I use the D-Fend Reloaded front end for DosBox. I have windows 3.1 installed in my dosbox. I created a shortcut on my desktop, which launches my dosbox installation, and starts …