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Hello,
I feel your pain trust me. I have one laptop I installed windows 8 pro on with a dvd. then I did the download of 8.1 preview, that is just one laptop. the one I mentioned in the earlier post. came with 8 PRO. then the preview and finally the app store update.
why is the secure boot there for is the question, I have learned only Windows RT has to have this to work, regular home / pro builds do not, it is not a requirement. I would turn it either on or off, your choice.
what I did to mine, while in bios, it is in your boot section, while I was there, I went ahead and deleted all keys that were issued to my laptop, on mine it is f 10 to save and exit, your machine will reboot twice and your onscreen message will be gone. remember the RT release is installed on tablets that use the ARM architecture. so if you have RT , you have to use secure boot. end the end of my battle, I turned it back on, although it is not mandatory, that is the way it came. or I would not had not gotten any watermarks in windows 8 pro. I also deleted the keys while there. if I understand correctly, secure boot has some control over the trusted software platform, IE - if you have RT, you cannot just add applications as one would in PRO, without breaking something, it kind of makes sense, but should have been explained up front, in my humble opinion.
so wrap up
RT = Secure Boot on is Mandatory 8 PRO.xx = Secure Boot is optional.
I also found it very necessary to do a soft reset in windows 8 pro, pre the 8.1 app download, I used the option, that did not delete my files, I think this will be mandatory as well, if one used the preview. you will have to run the windows update before the app store will give you the option, 3 manual updates gets the one you need, one just needs to, update, reboot, look at app store until it shows up.
I hope you find this of some help, I put many hours into these 2 machines, and I understand your frustrations, I have mine running now, and all seems well.
PS
My oldest laptop, Toshiba is NOT running Secure Boot and works great as well. :)
Its not just ASUS in my opinion. I have a DELL waiting on me now, I will know for sure after that, and will post what I find.
Ray
on The video game, if it worked on 8 before, it will be the video driver in my experience that's 20+, Netflix will not run with a certain AMD driver , it will load to 99% and clock, no errors nothing.