Found in Windows 9x machines, VMM32.vxd is the virtual device driverlibrary that contains virtual device driver files needed for system start up.
VMM32.vxd is different for every machine; therefore, if it gets corrupted, it cannot be copied from another computer; it'll need to be rebuilt.
Description of Windows 95 Startup Explains the 5 basic steps of the Winows startup process. Shows where the win.com and VMM32.vxd files fit and how they relate.
The Truth About VMM32.vxd Describes in depth and in laymans terms VMM32.vxd Also, exposes myths and rumors about the file. Even shows you how to rebuild it.