i use laptop and soundforge for recording sets...
open up SF (or other similar wav editor) and start a new recording..
connect laptop to mixer with 2xrca->stereo single jack to "line-in"
open WINDOWS vomule properties (double click speaker icon in taskbar)change to recording settings (options, properties, change radio button)
then play a vinyl and set mixer to 0.
go to SF and look at how the VU display meter is going, you should be hitting -2 at the most with just a single vinyl going at 0 on the mixer (leave a little headroom for when you go over 0 on the mixer ;) )
if the VU display meter thing is no where near -2 (over or under) then go back to the windows recoding volume properties and put up or down the "line-in" level - check back to the sound forge VU meter thing and see if your at -2...
if your line-in is not providing you with a good signal, (its all the way up on the windows recording properties) then switch to the mic-in and lower the level ALOT (ie lowest setting, its alot more sensitive then then the line-in!!!)
hope that helps.
Chaz.