I am having exactly the same problem with service pack 1 of windows 7 & have checked system requirements and my laptop is more than capable of running the program spec wise. Version 2.2.4 works fine, since that every version of 3 crashes. Some versions of 3 i can get tracks into rekordbox and it reads/analyzes the files & plays them fine in the bottom section. As soon as i drag file into top section for zoomed in waveform display it just crashes and "unexpected application error" pops up.
Any help would be much appreciated as this is getting really frustrating as most people i know are not having issues with it.