Is there a way to export iPhone slideshow to PC? I’m using an iPhone 5s and windows computer.

I’d like to watch and share the beautiful slideshow iPhone creates with Photos.
If you really really want it you can try a third-party app called, CoolPixel. It will let you record the slideshow as it plays. However, I am not sure of any issues that may arise from using it. (It's not in the App Store yet), but I have used it for a year now and I haven't noticed anything wrong with it. Try it at your own risk, though.