I'll keep this (semi) short and sweet. Think of this as the 'Dumping Windows for Dummies!' guide in the interest of privacy and security.
If you're sick of Winblows as a desktop operating system (OS), then you have LOTS AND LOTS of options from which to choose... as long they're all Linux. Yeah there's Mac, but that's just a different flavor of crap, and beyond that there's not much else other than Linux, assuming you want a reasonably easy to use OS with a large selection of software. ReactOS seems like it might be a decent open source alternative to Wintendo, but development is so painfully slow that we'll all be DEAD by the time they release a 1.0 stable (and i've been watching the project for... what? FIFTEEN YEARS?
The problem i, and many others have had when switching to Linux, is the shear number of choices there are. It can get real confusing real fast and i think that has maybe put a lot of people off. Not only do you have to pick a particular "flavor" of Linux (there are hundreds), but you also have to choose a "desktop environment" (DE). If you don't know what a DE is, it is the Graphic User Interface (GUI) that provides a comfortable way for us humans to interact with our computers. You know, all those buttons and widgets and icons and things? That's called the "desktop" or "user interface". With a Linux-based OS you can have several choices for a DE and that complicates matters even more. Avoiding all this hassle is one of the goals of this poor excuse for a guide.
Having a good deal of experience with WinDoze (noticing all the derogatory names i have for that pile of proprietary shit?) and some experience with Linux-based operating systems, which i've been using for the last 4 or 5 years, here's my personal advice...
Go to Mnajaro.org and download the generic 64 bit edition of Manjaro with the KDE desktop. The file you download will be an ISO and you need to write that to a DVD or USB stick (do the latter if you can since it's quicker). For writing to a USB stick you can use Rufus, or any other software that can create a bootable image.
With that done, jam that USB drive (or DVD if you went that route) in its socket and reboot. As your computer starts you'll need to boot from the USB or DVD drive instead of the drive that holds the Winlouse virus. How you do that depends on what kind of boot firmware is installed (BIOS) so you'll have to figure out which key to press in order to boot from your USB/DVD drive. A little searching of the interwebs should yield results without significant damage.
Assuming all that went OK, you'll have booted Manjaro Linux (yea!) and you can play with it all you want before deciding to install it.
Installing a non-Windows OS on a Windows machine can be easy or tricky depending on what kind of boot firmware is installed (BIOS or UEFI). With BIOS firmware the process is generally easy; click the installation icon on the Manjaro desktop and follow the prompts. If you're unfortunate enough to have UEFI firmware, the process can be a little trickier. You can thank Micro$oft for that, in part, because the assholes in Redmond don't want you running anything other than Wintendo. Either way, you should be able to learn all you need to know in the Manjaro User Guide.
Once Manjaro is installed you should be able to figure out the necessaries. The KDE desktop isn't a whole lot different than something like Windows 98, XP, Vista or 8. Windows 10 is a different animal and one reason i had for writing this is to prompt those of you running 10 to get the hell rid of it. 10 is SPYWARE and nothing less!
If you need more help, let me know. In the mean time...