In Windows, under Control Panel->Sound, set your Tascam as the default device for playback. Then Windows will just use that as your sound card for everyday use. The only drawback to that is that all of your system sounds come thru your interface. So when you have the volume cranked to work on a mix, and you get a REALLY FRICKIN LOUD system beep or ding, it scares the pants right off of you. And it upsets your dog. Then you have 2 puddles to clean up.
The alternative is to use your integrated sound card as your default playback device, and just tell your DAW software to use the Tascam for recording and playback. The drawback there is that you need speakers hooked up to both your sound card and your interface.