Hi - this latest update to Lion OSX To V 10.8.3 is not updating

The latest update seems to not be updating my OSX at all

I keep getting a message on my App Store to say I have an update and it requires a re start - Dialogue appera sand I opt for a restart and after the restart - I still get the same update available

Have tried it 5 times so far and for some reason the OSX is not updating at all.

Need some help = anyone have the same problem ?

In the past the update has always been seamless

Hamant