If you PC has HDMI out that is all you need. The receiver will support at least 5.1 assuming you have 5 speakers and a sub attached. HDMI cable from PC to HDMI in on the receiver. HDMI out from receiver to HDMI in on the TV. IF the PC only has VGA then you need to add a Video card that has HDMI. You PC may also have a Display port if it doesn't have HDMI and it "might" support audio with a Display port to HDMI adapter.
"Smart enough to know better, to old to care" ------ Dedicated Bat Cave Home Theater, JVC RS49U/Mitsubishi HC7900DW Projector, 110" 16:9 Jamestown screen with variable power masking for CIW 2.50:1 to 16:9, Marantz 7009 with 7.1.4 Atmos with Ohm mains,3 DIY Subs (2 15" (1 ported, 1 sealed and a 12" 4th order bandpass), 1 DIY butt kicker, Custom Built HTPC, 18TB DroboFS NAS