Have you ran the program Spybot Search and destroy? to rid of Spyware, i have found that msn fails to sign you in sometimes because of it.
if you don't have it, get it on
www.download.com
also get the program ad-aware SE that removes crap from your computer.
If it fixs then good but if you doesn't (which depends on the error) you are buggered :P
Mappy
December 2004