How to connect sony 5 1 home theatre system to windows computer

unfortunately that is a very basic model sound system and I believe only allows for 1 input - an rca connection for the dvd player. essentially it's a dvd player with speakers, so you may want to look for an AVR that supports hdmi or optical in. any larger speakers cannot connect directly to your pc - they need to be powered by an amplifier, which is often integrated into an AVR.