Ok, sorry. I'll try.
In My Computer, go to Tools (Toolbar at the top) > Folder Options
View tab > Show hidden files and folders. Click OK.
Then.. if it were me.. I would navigate to C:\Documents and Settings\Chris\Contacts
Note: Filtered out the email addresses for privacy.
In that folder, there will be another folder named after your email address.
Example: C:\Documents and Settings\Chris\Contacts\youremail@hotmail.com
Delete that folder. Restart Windows Live Messenger.