windows 7 pro also has xp mode.
depending on your new computer - you can install XP, it just may be a bigger process with drivers. Refer to the driver support of your computer model to see if there are in fact drivers for XP. if there isn't, it may still be possible using the internal hardwares vendors driver, but it is a deep process and you and the machine may become more involved than you would like to admit
do you mind if i ask what programs you are having problems running in windows 7?