try this, it worked for me....simple but it worked

go to start..then my computer...then open your ( c: ) drive
open program files...then scroll down and find your windows live folder and open it...open the contacts folder....right click the wldlog.dll file...click properties....change the name of the file from wldlog.dll to wldlog.dll_resp then click apply or ok, not sure if you can apply it...close this window and make sure the folder name changed inside your contacts folder to wldlog.dll_resp...exit the window entirely and exit your windows live messenger if you had it opened...re-open it and you should sign in without a problem

feedback would be great because i had this problem for a very long time and had a lot of trouble with it and stumbled across this method to fixing the program and it worked for me

It didn't work for me. :l