Easiest way to connect the hardware would be to use a mixer (which I assume you have with your decks) – this will give you a line level signal for your laptop line in (the phono signal from a turntable needs a voltage pre-amp to bring it up to line level – it will be too low otherwise, and the sound will be horrible). You can also get a dedicated USB box with a built in pre-amp if necessary.
As for software – any audio editing program pretty much (audacity, wavepad, sound forge, wavelab etc). All you need to do is be able to record to 16bit 44.1KHz wav and normalise to max out the signal level after recording which all of the above software will do no problem….
