Hi Megan and welcome to the forums. :flower:
It's possible to open up this unit, remove the hard drive and read the recorded files in a PC and you'll find other sites discussing this but I wouldn't recommend it for several reasons.
Firstly you could inadvertently damage something unless you know exactly what you're doing, secondly it has been known for PCs to slightly corrupt the drive when reading it in Windows and thirdly it's not exactly the most convenient method to have to dismantle your equipment every time you want to transfer a recording.
A much simpler method would be to connect a DVD recorder to the Humax and record whatever programs you want directly onto DVD.
You can then either watch the disc directly in your PC or copy the disc to your computer's hard drive and watch it from there.
If you don't want to keep them on DVD (as this is potentially just a means to an end) you can use a rewritable disc and erase it when you're finished.
That particular model doesn't have an HDMI output so in this instance you'll get the best quality by connecting the DVD recorder to the Humax with a SCART lead.