If you are running Windows Live Messenger have a go at the following:
quote:
Originally posted by Sunshine
Part of your Messenger client cache may be corrupted.
To attempt to fix, close down Messenger if it's running. Click Start > Run, and type:
%userprofile%\contacts
<enter>
If nothing appears in the folder, click the Tools > Options >Viewtab, click 'Show hidden files or folders' and click OK. Once youareable to see the folders, right-click the one that corresponds toyourPassport and choose Delete.
Next, click Start > Run, and type:
%userprofile%\Local Settings\Application Data\Microsoft\Windows Live Contacts
<enter>
Remove the corresponding folder again in this folder.
Restart Messenger and try signing in again.
I gave the same advice to a friend last night who had similar symptoms to you and it worked. Just so you know, it just clears your contact cache so you have to download it from the messenger serves again.