What model dvr?
If your pc has an coax input, you can hook up the tv coax on the 622/722(tv2 coax output), or 625(tv1 or tv2 coax output) to watch them on your pc.
If TV2 output is being used, you can use a simple splitter and split your TV2 output to your pc.(pc has to have a tv tuner for this that you can get chan 60 or 73, or whatever channel you watch TV2 on.
Or....if your pc has S-video and RCA inputs, you'll have to find some really long cables!