HT4718 I have bought a used mac air 2  which is now running windows .Who ever installed it has given all of the drive capacity over to boot camp.I now want to restore lio but want to know if there isa way of keeping windows as a dual boot .

Hi. i have bought a two month old Mac air book 11.6 with 64 gb ssd .The previous owner installed windows and I want to reinstall Lion.Is there a way to do this and keep windows as a dual boot system.If so what size partition is best for windows..I am new to apples having always had PC,s .When the previos owner istalled windows he made the whole drive something called bootcamp.Help!! Roy

Before you do anything else, I would make a copy of the Windows system on to an external hard disk.  Carbon Copy Cloner (CCC) will help you do this.
Bootcamp partition needs to be set up using Bootcamp Assistant, from within Lion. There are sometimes problems using third party disk management apps, and the partition order is important too.
I suspect the previous owner should have re-installed his original OS before giving you the computer. Are you saying that there is no Lion on it at present? If so, you will need to get it, or if it was Snow Leopard, the installation disk, from him.   In the latter case, with SL 10.6.8 installed, you can then access MAS to buy Lion.
Once you have Lion installed you can setup Bootcamp and restore your Windows system to it, from the external disk.

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