I am using this darktraveler's tutorial for installing dosbox in Windows 7. The problem is that when I type the boot -l a command (with the letter L) to boot into dos, dosbox closes unexpectedly and boot -1 a (with number 1) the image disk (622.img) doesn't mount. The command seems to crash in daum dosbox and regular version of dosbox 0.74. I think that the tutorial uses the command -l a (with letter l) to mount the 622.img image to boot into dos. I appreciate some help for this issue.