This has not been replace by a 2011 version search this site for updated instructions

1. Download Windows Live Installer from download.live.com.
2. Install or upgrade the Windows Live Messenger to latest version.
3. Open Windows Explorer, and set it to Show hidden files and folders and show protected operating system files (uncheck the tick for Hide protected operating system files) in the View tab of Folder Options.
   
   In Windows Vista, run Windows Explorer as Administrator, and user may requires to take ownership and gain full control permissions for the folders below before able to access them.
4. Browse to \Program Files\Common Files\Windows Live\.cache\ folder.
5. There will be a lot of folders made up of 15 characters and numbers. Locate Messenger.msi file inside one of the folder. Messenger.msi is the individual separate standalone setup installer for Windows Live Messenger 2009, which can be backed up or copied to another location. Do note that the Messenger.msi and other Windows Installer Package retrieved this way is silent installer.
   
   Tip: %ProgramFiles%\Common Files\Windows Live\.cache\cache.ini file contains the paths of all Windows Live software products downloaded or installed on the computer.
    
6. If you have any problem with Windows Live Messenger after installation using the standalone individual installer Messenger.msi, try to install the following 3 programs too, all of which in different sub-folders inside the .cache directory.
   
   Contacts.msi (Contacts)
   dw20shared.msi (DW 2.0 Client)
   crt.msi (Microsoft Visual Studio Runtime)
   
   Tip: Contacts.msi is a must to avoid or fix 8000FFFF error.

After grabbing the Windows Live Messenger standalone silent installer, optionally user can uninstall the Windows Live Suite (all programs) from Control Panel, and install Messenger.msi (and Contacts.msi too) again to get rid of all other Windows Live components except WLM9, saving time and bandwidth in future installation.

The trick also work for all other Windows Live products such as Windows Live Sign-In Assistant (wllogin.msi), Windows Live Writer, Windows Live Mail ,Windows Live Toolbar, Windows Live Photo Gallery, Windows Live Family Safety, Segoe UI Font, Windows Live Call and Microsoft Office Outlook Connector.