Migration failure of Windows7 using an external storage device

Hi everyone, I'm Japanese so please excuse my poor English.

I tried to transport my Windows7 OS to my MacbookAir using an external storage device (USB HDD).
At first I had Win7 migrate to USB HDD using Parallels Transporter.
Resulting Windows7.pvm is about 10GB.
Next I tried to install Win7 using Parallels Desktop7 but failed.
I don't know why.
Under installation process Parallels Desktop7 said,
"You need log in Windows as administrative privilege."
and..
"512 MB physical memory installed

SCSI controller is not installed.
Network bootrom is installed.
Trying to to boot boot from SATA drive 1...
Missing operating system_"
I attached this picture.


I know I need log in Windows but I don't where to do.
Anyone has suggestions?

 

same as you , no answer ?