Hi, i have a big problem: i've bought a Dell laptop, an Inspiron 5721, in july and a couple of month later, after that my mother caused a problem, i decide to format the hard disk. After that, i was looking for the product key on the laptop's back, but i didn't find it ! So i decide to try to download a windows 8 copy, using utorrent. When i've installed the O.S, i choose the wrong version, Windows 8 Pro, instead of Windows 8 OEM, and so i've discover that i wasn't able to update my Win8 to 8.1.
Now i want to reformat the hard disk and install the right version of my O.S, but i want to install it in UEFI mode. I Tryed to Boot from Usb pen drive, previously formatted in gpt for UEFI boot with a program called Rufus, but when the pc did booted, my bios didn't find my pen drive!! So, for my curiosity, i enter in my bios, just to read which UEFI devices my computer can use, and i have found only IPv4 ad IPv6. No USB.
How can i fix these my mistakes??
(I have no backup, only one for the drivers)