ACRONIS2009

I have just purchased ACRONIS 2009 backup program and would be grateful for some advice on how to proceed as I am a novice and wish to back up just files etc . I am moving to a new computer but do not wish to tranfer the Windows system which is XP sp3 or any Programs as I am having a lot of trouble with either the Registry, Drivers or software and therefore need to start afresh I have an external E disc WD My Book. Thank you