Also note that the some problems with the Contact List Cleaner, or in other words the Reverse List of Messenger itself, can be caused by manipulating the files of Messenger.
For example: removing or renaming wldlog.dll to '
fix' the problem of not being able to sign in, is one of these causes!
see -SOLVED- Windows Live Communications Platform has encountered .......
So, if you ever tried to fix a problem in Messenger by removing, renaming or hacking Messenger (like changing the version number), then please undo what you have done. Even if you did something like that in the past, with a previous version, the problem might still be there depending on how you upgraded to or installed the new version.
In most cases, this means completely removing Messenger and all of its components and files. Then download the newest version and reinstall. Using the repair function in 'add/remove programs' isn't going to work.
The Reverse List not being correct is just one example of the many underlying problems which will occur if you try to manipulate Messenger.