you get that error because you don't have aspi layer.
get it from here and restart your pc after install it.
http://www.adaptec.com/worldwide/sup...s+ASPI+Package
after saving the iml file, you will get error about your burner is not recognized, ignore them and you'll see recording window,
goto file -> export image and enter this name -> "image" and save it.
now open windows wordpad and type this line,
Copy /b image.000 + image.001 + image.002 + image.003 disk.iso
save it as "merge.bat" and put this bat file in same folder with those image parts and run it, burn the iso.