Running 64 bit Windows 10 w/only 3GB of memory--interesting.
Yes, especially since at the moment I am only running Windows 10, Firefox (with a dozen open tabs), and my security software, and 3.8GB of my memory is in use.
For reference, my baseline memory use after a fresh boot with just Windows 10 and my security software running is about 2.4GB. I have found that even 4GB memory is barely enough for Windows 10, and my current PC is running well with 8GB.