Your log has a few "loose ends" in it, but nothing that looks like it would be the culprit. You are running a slightly older version of HijackThis, though. Just to be on the safe side, please download the latest version (1.99.1), run it, and post the log it generates.
The last time you had this problem, it was due to malicious infections if I recall correctly, but that might not be the case time. There are non-malicious causes of login problems with hotmail, msn, etc. accounts; some of the related threads in the following link have suggestions you might want to try:
http://www.daniweb.com/techtalkforums/search.php?searchid=353268