ive had no sound for the past two days....

when i check the device manager, microsoft WINMM WDM audio compatibility driver appears with a yellow colored "!" mark....
here is a snippet of my system summary report from EVEREST..... any help??? thanks in advance..
--------[ Summary ]-----------------------------------------------------------------------------------------------------
Computer:
Operating System Microsoft Windows XP Professional
OS Service Pack Service Pack 2
DirectX 4.09.00.0904 (DirectX 9.0c)
Motherboard:
CPU Type Intel Pentium 4, 2000 MHz
Motherboard Name Asus P4S533-VM (3 PCI, 1 AGP, 2 DDR DIMM, Audio, Video)
Motherboard Chipset SiS 651
System Memory 736 MB
BIOS Type Award Modular (09/11/02)
Multimedia:
Audio Adapter SiS 7012 Audio Device