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Mick
(Site Admin)
The solution is to download the Combo 10.7.3 updater directly from Apple and install over the top of your existing installation.
Direct download :- http://support.apple.com/kb/DL1484
In most cases you will not experience any anomalies when using "Software Update" for this system update, but just in case.
Details on Macrumours :- http://www.macrumors.com 5th article in the list.