What program are you using and what audio card do you have? You say many channels...how many is that exactly?
If you're wanting to record simultaneous multiple tracks to your pc, you'll need a multi-input audio card. The mixer in it's self isn't needed for this unless you're planning to use the built in mic-pre's.
The idea of the mixer is to blend multiple tracks together then send them off to your recording device or other effects n stuff. The built in mic pre's are simply an added bonus but, we're still talking about behringer stuff. Not to knock the product all together but, if you don't really need the mixer and effects, eq, pan and faders, you're spending a lot of money on a low end set of mic pre's. If there is a channel insert for every mic input on the mixer, you could run the channel inserts to your audio card and do it that way but this again really negates the need for the mixer.
Depending on what you're doing the mixer, it might be nice for out of the PC work and/or monitoring. Not trying to shut down the mixing board idea...I've got a couple here too but they're mostly used for monitoring during rehersals or tracking.
Tell us a little more what you're hoping to accomplish.