To reinstall Windows 8 on your computer, you can follow the instructions mentioned on the links below:http://windows.microsoft.com/en-us/windows-8/clean-installhttp://www.wikihow.com/Install-Windows-8
Hope this will help you.
Acer recovery mediaif you are in the US you can buy it:http://store.acer.com/store/aceramer/en_US/eRecoveryif you are outside the US, you must call/email your regional Acer support service:http://www.acer.com/worldwide/support/
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