are you on static or dynamic ip cable? if it's dynamic, you've got to leave the dns servers set to automatic, what you might be able to do is change your dns server conifg for active directory and set it up so that your dns server only handles requests for local addresses and everything else is forwarded to your isp's servers, i'm not sure how to do it, but if you can't figure it out i'll ask the network tech @ school / work and let you know how
