How to really uninstall MSN Beta from vista?

I've tried the new beta msn, it didn't work, so I've uninstalled it from Programs and Features in Control Panel. Uninstallation completed successfully and I tried to install 8.5 and other earlier versions of MSN, but all failed with message, something like: "You already have newer version of MSN installed..." Question is: How can I say to earlier versions of MSN that I do not have a newer version installed, what files and what keys in registry to delete?.
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MereteCommented:
Make sure that you delete the logs in the program files
the other files of msn messenger including any empty folders old folders.
There is probably an old regestry key as well.
I am borrowing this from Ask Leo so can't take full credit for it.
in the run type this>>
 msiexec /x {B1403D7D-C725-4858-AACC-7E5FA2D72859}
source
http://ask-leo.com/how_do_i_uninstall_windows_messenger.html
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Windows Vista

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