download a keylogger such as 007 spy software which takes screen shots, key strokes, etc
go to C:\Program Files
hit prt sc sysrd button above the home key, depending on what key board you have, open word, hit paste. This will do a print screen of your program files. if they add or uninstall any of those games, usually the game folder will still be there so when you get home, open word and compare those files with the ones on your system now.
the best way thou is the keylogger