RAM maxing out?

Even when idle, my pc ram gets maxed out by tons of system processes. I have 8gb ddr3, and sometimes it gets to 7.8 gb used at idle. Big offenders are Cortana (even though i have it disabled), and system and compressed memory. Any suggestions to keep this from happening? PPPPPPLLLLLLLLLLLLLLLSSSSSSSSSSSSSS HALLLLLLP !!!!!!!!!!!!1!!!!!!