Feel really stupid now!! After all this time with this problem I only just started playing around as it was never a big problem before, only just started getting annoying.
Anyway, I only just realised, I almost ALWAYS have a cd in my other drive which is a samsung cd burner (I am constantly playing games so leave the disc in for convenience) so I tried taking out the disc and then trying opening and ejecting my empty NEC drive and now no more sticking whatsoever!!
Sorry about that, I should have really tried things like this out before posting, something so simple just never crossed my mind.
Not being very technical when it comes to comps though, I would still be curious to know exactly why my NEC drive sticks only when I have a cd in my other drive.