Or if you have a license for XP you can use Virtualbox or VMware Player, both free, to install XP into a Virtual Machine.
I have found XP Mode much slower to load and not as functional as installing a REAL version of XP into one of those other VM programs.
One thing was I could not use Outlook Express in XP Mode. MS has limited, at least that is the way I found it, XP Mode to do just certain things. With a real version of XP loaded into some other VM software package you get full functionality out of XP.