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As you mention win8 is not certified platform. You may try to remove Oracle software by following:
11.2: How to Manually Remove Oracle Server Software on Microsoft Windows Platforms [ID 1069034.1]
WIN: Manually Removing all Oracle Components on Microsoft Windows Platforms [ID 124353.1]
For your issue as mention here you can create linux or windows vmmachine than you can try installation on it. For linux you can use OEL linux which you can download from e-delivery site freely.
If you make search you can find many good link which explain to create vm machine and installation