If you are using ARM-based emulators, you must install Virtual PC 2007. Download the installer from the Microsoft Download Center at www.microsoft.com.
You also must install Virtual PC 2007 for the following tasks:
(Windows Vista) If you want to use emulators with the Mobile Module on host computers that use Windows Vista, you must download the Microsoft Device Emulator 2.0. Download the installer from the Microsoft Download Center at www.microsoft.com.