Rekordbox 4.2.1 immediately crashing

As per title, As soon as i open rekordbox a popup says "not responding", ive done a fresh install 3 times but still the same result.

I have some tracks analysing when i open rekordbox that i had forgotten about, would this have something to do with the problem? And if so, how do i stop them from analysing?

Computer is windows 7 64 bit core duo