[Hypnotic2010]

Try taking the battery out, put it back in and reboot.
If no-Are you are able to sync the phone, can you grab the file through activesync?
If no-If its possible, maybe you could install something called Safemode 3.1, then boot in safemode. Maybe then you can get there.?

And for future reference you can use programs like Windows Live. It allows you to save your contacts online. So after a reflash you would just login to windows live and puts all your contacts back every time.