Hello Simonmarcus,
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You stated that you have Windows 8 by default and you installed Windows 8? Can you correct this so I know which operating system you are looking for help with? Also if you could elaborate a bit on your issue so I have a clear idea of what is going on it would be appreciated.
Please re-post with the requested information and I would be happy to provide you with assistance. Thank you for posting on the HP Forums. Have a great day!