Hi, I'm Pete. Welcome to JustAnswer! I'm reviewing your question now, and will post back with your reply ASAP.
Henry, you can use lots of different software on Windows 10 to process your PV-GS300 recordings.
You could start by trying the built-in Windows Media Player, or there are lots of others available from the Windows App Store if you prefer something different.
If you would like some remote assistance with this, I'd be happy to help :)
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We can reply back and forth until you are fully satisfied.
To transfer the footage from the camera, simply copy and paste it from the camera to the computer, as you would with any other external memory device.
Let me know if you need anything else.
Ok, all the best! :)Pete.