1. Exit MSN Messenger by right-clicking the MSN icon in
the notification area, and selecting Exit.
2. Add the following registry entries, both with a DWORD
value of 1:
HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Messenger\Cl
ient\PreventRun
HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Messenger\Cl
ient\PreventAutoRun
3. Open a command prompt by clicking Start/Run, then
typing "command" and clicking OK.
4. Uninstall MSN Messenger by typing "rundll32
advpack.dll,LaunchINFSection %systemRoot%
\INF\msmsgs.inf,BLC.Remove"
5. Uninstall the leftover installation information file by
typing "rundll32 setupapi,InstallHinfSection BLC.Remove
128 %systemRoot%\INF\msmsgs.inf"
6. Allow MSN Messenger to be displayed in the Add/Remove
Windows Components dialog in the future (if it pops up
again!) by typing "notepad.exe %systemRoot%\INF\sysoc.inf"
and deleting the word "hide" from the line that starts
with "msmsgs=". It MAY be possible to skip to this step
directly and perform the uninstallation directly from the
Add/Remove Windows Components dialog, but that method MAY
leave unwanted components and has not been thoroughly
tested.
7 . Reboot!