Realtek ac97 compatibility

Hey guys I'm new to sonar and new to this forum, so I'd really appreciate if someone can help! I have installed sonar 4 onto my toshiba sattelite laptop, which has pentium 4, 80 gig hardrive and 512 ram, with a realtek ac97 as the only sound card/device. When opening sonar a messege window opens stating that the driver does not support the current audio format or is in use by another application , then asks me to disable or use anyway. Unfortunatley its the only sound card on my laptop. what can i do?