Can someone possibly tell me why only 3.9 of 8 GB of ram is available with no programs running? Also when I pull up task manager it tells me 100% of disk is being used and 70% of memory is in use with no programs running? Computer is overall laggy and slow. I'm attempting to play pubg also which is very intensive on the computer, in doing so nothing renders, very low fps and extremely laggy not playable at all. I think something is seriously wrong with my computer. I've attempted every solution I could find on youtube and google but nothing has helped me so far. Thank you for reading this any help would be greatly appreciated.