Vista - Virus; Uninstallation and failed validation prevented Re-Installation

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I should not have deleted Windows Live Messenger , now I can't
download it as getting a message of upgrading windows which failled
validation.
Can I restore system on back dates to get back my corrupted messenger
as uncorrupted messenger?
Here is Windows Live Installer Error:

" Sorry, Windows Live programs cannot be installed on windows server,
windows XP Professionalx64 Edition, or windows operating systems
earlier then Windows XP Service Pack 2."

Is there a way to install it free without passing through validation
and Live Installer trouble?

Greetings,

Yes you can system restore

and yes you can install without the live installer -- from here:
http://messenger.jonathankay.com/redir/wlm85.asp

--
Jonathan Kay
Microsoft MVP - Windows Live Messenger/MSN Messenger/Windows Messenger
Associate Expert
http://www.microsoft.com/windowsxp/expertzone/
Messenger Resources - http://messenger.jonathankay.com
All posts unless otherwise specified are (c) 2007 Jonathan Kay.
You *must* contact me for redistribution rights.
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