Ideally find someone in the family who is interested in it and get them a copy of the latest version of Family Tree Maker with a free 30 day Ancestry subscription. If the paper version is any good you can strip mine the Ancestry database to confirm what is written down. Be sure to follow the instructions to cancel your free trial carefully.
I'd be very suspicious of anything claiming to go back past the 1600's unless the name was very very unusual. It gets incredibly difficult when the records are handwritten in Latin and origin is "out of county".
I reckon Legacy on Windows is pretty good as free software goes. Options online here:
Whatever you use make sure it can import/export GEDCOM.
Possible but a lot easier into a database intended to cope with multiple spouses and quirky unmarried couples and couplings.
+1Also check your data against IGI and/or Ancestry as you do data entry - nothing worse than adding loads of duff relations to a database.