If you are using Windows 7 Professional or Ultimate, download the installers for Windows Virtual PC and Windows XP Mode. This won't really "add" XP's Free Cell to 7, but it's about as close as you'll get.
Solitaire and Freecell are unusable on Windows 7 unless you have a card capable of running Aero.
If you want the XP version to run on Windows 7, then what you need to do is to copy the "Freecell.exe" and "Cards.dll" files from the C:\Windows\System32 folder on your XP system to some other folder on your Windows 7 system. Put both files in the same folder, but don't put them into the System32 folder 'cause they'll wipe out the Windows 7 version of the program.
To run the program, just double-click the "Freecell.exe" file. You can create a shortcut to the file on your desktop or pin the program to the taskbar or start menu.
hi there. I'm from the Philippines. i too love freecell and now thanks to you i can play with joy and ease. thanks for the tip on how to transfer the old xp version of the game and make it run with windows 7. you are a genius. rgjazziz