Hello Adakovskis, welcome to the forum!
If you want to see movies / hear music that you have on your PC I'd use a USB2.0 stick or external hard disk. If you use a hard disk you'd even be able to see HD movies on your TV assuming it is HD

and use the Philips to have surround sound. You cannot use a HDMI to connect your PC to this system. You could use a HDMI to (possibly) connect to your TV (from your PC) but then you'd hav no way of using the new soundsystem.
Below are the connection details:
Connect the USB device to the USB connector. If the USB connector is the wrong size, use a USB extension cable.
When the player detects the USB device, it displays a message on TV for a few seconds.
Press DISC/USB on the remote control. You see a list of your USB files on TV.
Press the navigation buttons to select a file, and then press OK to play it. You can press DISC/USB on the remote control at any time to return to disc mode.
When you are finished:
Press to stop playing from the USB device, or press DISC/USB to switch to disc mode.
Disconnect the USB device.
If you have problems, make sure that:
The USB device is working.
Connect it to your PC to see if it works.
The files you want to play are in a supported format and are not corrupt.
Try to play them on your PC.
The USB device complies with the Mass Storage Class protocol.
This protocol enables devices of different brands and models to communicate with each other.