Can't download the additional components needed to install mac os x, what shall i do?

can't download the additional components needed to install mac os x, check your internet connection and try again-  that's the error always showing when im reinstalling the os on my macbook air. what shall i do? please i need help.

Not sure 10.7.3 is still available over the internet download system. I think Apple waws more on the ball this time and switched the Recovery HD system download over to 10.7.4 fairly Quickly.
That may or may not be part of your problem.
It may also be your internet connection is flakey and is dropping the connection with the download server.
If you are doing this over a WiFi connection try connecting the Mac to your router with an Ethernet cable.

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