Jetpack Plug-in Update Failed

Update stalled and displayed error message.

Site is now inaccessible.

Warning: require_once(D:\Hosting\2772443\html\wp-content\plugins\jetpack/_inc/lib/tracks/client.php) [function.require-once]: failed to open stream: No such file or directory in D:\Hosting\2772443\html\wp-content\plugins\jetpack\class.jetpack-tracks.php on line 6

Fatal error: require_once() [function.require]: Failed opening required ‘D:\Hosting\2772443\html\wp-content\plugins\jetpack/_inc/lib/tracks/client.php’ (include_path=’.;C:\php\pear’) in D:\Hosting\2772443\html\wp-content\plugins\jetpack\class.jetpack-tracks.php on line 6

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