Hello i have a problem with my MacBook Air they wiped out the operating system then installed windows 7 how do i re install the apple firmware

Hello i have a problem with my MacBook Air they wiped out the operating system then installed windows 7 how do i re install the apple firmware please help

That is incorrect. You can install Windows on a Mac, any Mac, without having OS X installed on it.
To the OP you will need the original system reinstall USB thumb drive that came with your Mac Air if it is older than a Mid 2011 model or if it is newer than a Mid 2011 model you use the Online Internet recovery system.
If you don't have that original reinstall USB thumb drive you can order one from Apple for a small charge. Call Apple and ask to speak to someone Specifically to order a Replacement USB system reinstall thumb drive for your model year. You will need the serial number of that Air. It is etched into the bottom of the case.
Eric Ross wrote:
You can't run Windows on your Macbook Air without having Mac OS X installed with Boot Camp.  So it should be an option to select the Mac OS X partition at startup when holding down the option key.  Take a look at this link, http://support.apple.com/kb/HT4818

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