Christian and Beccy yeah both are available, old and new

http://www.filehippo.com/download_msn_messenger/


Down the right hand side in blue text, newest version at the top, oldest at the bottom


Mines the 8.0.0812 version and its never had probs signing in really so try that if you havent got it, if that dont work dont try anything older than 7.0, but to be honest i cant see a different version making a difference but it wont hurt to try.

Another thing, can you try your id on a friends msn to see if its working ok or maybe give your password to someone so they can try it? at least you can eliminate your pc and setup if theres dont work either