Windows Live Messenger may have some of great features but problems it has created for users are hell lots of problems like sign in issue, uninstaller issue, downloading issue. Most of the threads of any forums are all running around Windows Live Messenger signup issue.
Most of all this issue can be solved by just removing Windows Live Messenger. In order to completely uninstall and remove windows live messenger here is one freeware utility ZapMessenger. ZapMessenger is the one step tool to completely remove Windows Live Messenger, MSN Messenger and Windows Messenger 5.x.
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How to Completely Uninstall Windows Live Messenger with ZapMessenger