64 bit Windows has no native 16 bit support at all. This actually comes from a limitation in the processor itself that 64 bit mode can't use virtual x86 mode that 16 bit emulation uses. 32 bit Windows has 16 bit support by using WoW to emulate the 16 bit protected mode environment. Also, just to let you know, on Windows, command.com actually runs backed by the Windows csrss like cmd.exe so there isn't much of a difference between them. Whats more, 16 bit console applications would be emulated by VDM regardless of where it came from and the VDM, which is seperate from cmd.exe and command.com, is a protected mode 32 bit application.So it works like this64 bit Windows, emulates 32 bit Windows, no support for 16 bit.32 bit Windows, emulates 16 bit Windows, no support for 64 bit.Whats more, the trend is going towards 64 bit Operating Systems with 32 bit emulation and no 16 bit support.So you have two options unfortunately, use a virtual machine with a 32 bit operating system installed on your 64 bit Windows 7 or use a 32 bit version of Windows 7.Of course, you could always put FreeDOS into a virtual machine and run DJGPP from there.