I have an HP laptop with 8Ghz memory
A better question might be whether it is even possible. My understanding is that laptops running WindowsRT have arm processors, and you cannot install ‘normal’ Windows, which runs on x86/x64 processors, eg. http://en.community.dell.com/support-forums/software-os/f/4677/t/19521140
Best to check this with HP.
If it’s running Window$ RT, it’s running ARMv7, meaning you can’t install Window$ 8.1 on a RT 8.1 or do the opposite cuz it’d be like putting someone’s A blood in someone whose blood is O. While the system wouldn’t attack the regular 8.1, it won’t even begin to start the bootloader, let alone start Window$ problemlessly.
Bottom line: on hardware level there’s no compatibility between RT and non-RT. You’re busted if you have Window$ RT device until a program (or a game, for that matter) releases Window$-on-ARMv7 or Window$ RT edition. Stick with non-RT unless you’re absolutely sure you’re covered.