In order to get a Series 2 to use its line inputs and record from them, you have to lie to it about having a cable box or satellite receiver.
This requires going through at least part of Guided Setup again, and will require the TiVo to contact the TiVo servers for program info on the cable or satellite service it thinks you have.
Which probably won't happen because the TiVo servers will see that the account status of that TiVo is "not subscribed".
To get the TiVo to co-operate with having recordings copied off of it over a LAN to a PC, it'll have to have that feature enabled, which requires going to the TiVo website and logging into your account, which you don't have.
Some sort of video capture card in a PC would probably be a much better solution.
I don't know of any particular brand/model to recommend or warn against, but you could plug
site:
http://www.tivocommunity.com/tivo-vb/index.php? video capture
into Google and see if capture cards have been discussed over at TCF in the past, or go to
http://www.tivocommunity.com/tivo-vb/index.php?
and try the onsite search tool.
And you could try the onsite search feature here at DDB to see if anyone talked about it here in the past.