If you both genuinely liked each other or had some sort of chemistry surely you would have seen each other in the space of 2 years?
I don't know what the circumstances are, but it sounds like you're too eager and she isn't as bothered. I could be completely wrong though. (I hope so)
My suggestion - speak to her on the phone because it's easy to talk for ages on msn, and then meet up for a drink or something. I would do it in stages rather than 'haven't seen you for 2 years but let's do something big for our 1st date/get together'. So do smaller things fairly regularly, build your relationship back. Ultimately though what I'm speaking is balls because I don't know either of you, and you are probably the best judge of what to do! Do what you feel is right.
Edit: You need to have more faith in yourself. The probability is you do have a chance, so don't keep questioning yourself and get out there!