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Are you unable to install Windows Live Messenger 8.5 Beta (MSN Messenger 8.5)?

Do your installation gets stuck at “Please wait a few moments while we get your computer ready for the installation…” ? The installer disappears and does not continue after this screen?

You can proceed with the following:

Make sure you have “show hidden files” set on your system.

You can set it by going to “View > Folder Options”

And select “Show hidden files and folders”

If you are on Windows Vista, browse to:
C:/ProgramData

And if you are on Windows XP, browse to:
C:/Documents and Settings/All Users/Application Data

Now delete the folders WindowsLiveInstaller and WLInstaller.

Run the installer again and everything should work fine.