Ann recently upgraded a computer from Windows XP to Windows 7, but one of her applications
does not work now. Which of the following should be done FIRST?

A.
Set the application to run in XP compatibility mode

B.
Reinstall Windows XP

C.
Configure a dual boot with XP and 7

D.
Install the application in XP mode

Explanation:
http://arstechnica.com/information-technology/2010/01/windows-xp-mode/