My laptop has 16 GB of RAM, but the task manager shows me that 50% of it is already used at 2 GB. According to my calculations, that makes 4. I have often had the problem that Firefox pulled 7GB and still 99% was occupied, although (according to the task manager) nothing else needed RAM. And yes, I know that some system processes need ram, but never, ever 8 GB
I would say: let the virus scanner run over it.
Install cpuz go to the memory tab and see what is there. You can write again, then I'll tell you what's going on. Did you expand the ram yourself?
Ne was preinstalled