Originally Posted by Jpup
how do I know if my sound card has a line level input or how do I switch it to that? I have no idea what that is.
Just try sending the audio from your tape player into the computer's mic input and see if the computer records the input at a level that's way too loud.
If it doesn't, you don't need to worry about it.
If it does, you'll need to do some poking around in the sound card's Windows control panel (and the sound card's user manual if you don't find a switch in the control panel).