No audio device problem

Hello,

No audio device after installing microsoft windows sp3.

system details

Microsoft windows XP
Professional
Version 2002
Service Pack 3

Computer :
Intel (R)
pentium (R) 4CPU. 2.8 GHz
2.79 GHz, 1.00 GB of RAM

When I go to device manager in the system properties, under 'sound, video and game controllers', the Realtek AC'97 is with an yellow icon.
When i double click on that, it shows that ' this device cannot start. (code 10). Click the troubleshoot to start the troubleshooter for this device'. But the troubleshoot is not enabled. I am not able to figure out this problem.

Any help would be greatly appreciated

Thanks in advance