best sound out of a laptop ?

[Rothchild]

does my pc have any sound card ? at system information ,all it says is , high definition audio device by Microsoft "

Probably, if you want you could probably just use a 3.5mm jack to RCA (aka 'the most useful cable in the world') to take a feed from the jack output of your laptop in to your amplifier to get you started.

IMO it's best to keep signal chains and stages as short and minimal as possible so pick a device that works, you can afford, offers the features you need etc and keep it simple!