There are
many different versions of Linux.
I settled on using Linux Mint Xfce, the lightest of the 4 Linux Mint distributions.
At the beginning I'd recommend getting on a USB from Ebay.
Then follow the instructions to dual boot your computer with Linux and Windows.
This means each time you sign on you can choose to either go to Linux or else go to Windows.
Thus you are saving everything that's already there and not removing anything.
However when you choose to go to Linux you won't have the clutter thus it will be faster.