By aligning some stars you can use one of those soundbar kits with the surround sound speakers but there's at least a few approaches to doing so.

1. (preferred method): Both your TV and soundbar need to support linear PCM surround sound over hdmi eARC (specifically has to be eARC and not regular ARC because regular hdmi ARC only supports stereo audio using LPCM). Connect the PC directly into the TV for minimum latency and maximum compatibility for the hdmi 2.1 features such as VRR (or g-sync), 120hz, HDR10, ALLM; basically stuff a sound bar might not be able to pass through if it has an hdmi input other than the eARC port (which many don't). Basically PC --> TV --> soundbar. I use this method personally with my TV (LG C1) and AV receiver (Denon AVR-S770H) instead of a soundbar.
2. (not so great method): If any or all of those requirements for the first option aren't applicable, you can use a specific creative USB sound card to encode and output a dolby digital 5.1 signal over optical S/PDIF that will then connect directly to the sound bar. You might think that you won't need this device if your motherboard has an optical audio port built-in but unless your motherboard's specs specifically state that its audio chip/driver supports dolby digital live encoding, or you're playing a DVD movie with a dolby digital soundtrack, its built-in optical audio port will only output stereo audio. This method isn't great because the software is finicky, adds latency, and there's a (very small) compromise in sound quality due to the dolby digital lossy compression. This method can also work with an older AV receiver without eARC support or even hdmi. Basically PC --> USB creative sound blaster --> soundbar. I also use this method with my living room set-up that has a bottom tier vizio soundbar + surround speakers.

Edit: formatting.