I'm not sure what you are asking? Do you want to edit HDTV on the computer? You can just 'rip' the DVR disc to the computer hard drive and edit or do what you want with it. Some use rewritable DVDs for that. If you wanted to record it directly to the computer, it would depend on the format your cable box outputs and what type of capture card you are using in the computer.
It would probably help to list the models of your cable box and DVR and someone here is likely familiar with them.
HD video takes up a lot of space, so you may want to convert it to SD if you want to store it or make a conventional DVD. Also, if you only have a 40GB hard drive, I would seriously consider adding a larger drive or two.
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