Cannot revert to Windows 8 after installing Hyper-V Server 2012 R2

I own a laptop with a pre-installed Windows 8. I've installed Hyper-V Server 2012 R2 on top of it by mistake, and now I would like to get rid of it and revert it back to Windows 8. I've tried doing so by a backup USB, though it doesn't seem to work. Is there
anyway to do this without having to use a disc? I haven't received one when I bought it.
Thanks for any help in advance.

Found something for specific computer. Find similat info for your computer:
Acer Recovery Instructions:
1) Power on the machine
2) At the ACER BIOS screen, press and hold the 'Alt' key and the 'F10' key simultaneously to start Acer eRecovery.
3) Once eRecovery utility is displayed, click 'Restore to Factory Default Settings'.
4) Click 'OK' to continue
5) The recovery process restore a fully functional factory image of Windows.
6) After eRecovery has completed, press 'OK' to reboot the computer.
Acer Recovery Media Purchase Program:
https://secure.tx.acer.com/RCDB/Main.aspx?brand=acer
This site is used for purchasing recovery media for your Acer product. 
To get started, please enter the serial number or SNID located on your Acer product and click "Next"
System Information
Get your system information:
http://secure3.tx.acer.com/FindSystem/FindSystem.aspx?title=Information%20About%20Your%20System
Acer Main Support page:
http://www.acersupport.com/
Regards
Milos

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    I couldn't get to stage to assign IP to VM, because I wanted to install all important updtes before I do any thing else. 
    Regards, 
    Shahzad.

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