After update combo startup takes longer to load

Bought new iMac

Straight out of the box and switch on it says updates

So I click updates it gives me combo lion update that takes an hour

The after startup which is slower than when I 1st switched on out of box

I tried something on the forum page someone had said

Verify permissions they say that all things on the iMac differ to what they should be so should I repair the permissions or not ? Help