yes i had the same problem i uninstalled the prog (live messenger its now called) and i clicked on: MY COMPUTER> C: drive > Documents and settings > (your name) > Application Data > Microsoft > MSN messenger (or Live messenger depending on which version you have) and I simply deleted the folders then went onto the windows live messenger site and downloaded it again and installed it and it worked!! only took me about 4hrs to suss it out lol! but it worked for me :)
daz bee, December 2008