Start VirtualBox machine automatically at computer startup, windows

Go to C:\Program Files\Oracle\VirtualBox and create something like autostart.cmd:

autostart.cmd content:

"%~dp0VBoxManage.exe" startvm "proxy"

"proxy" is name of Virtual machine

For hidden startup use:

VBoxManage startvm --type headless "DC"

where "DC" is name of Virtual machine. For example Domain Controller

Copy the autostart.cmd

Explore startup programs for current user:

Past the shortcut of autostart.cmd!