我之前好唔小心咁刪左個多媒體音訊控制卡!!!

Get relax first.
Check the brand and model of the video/sound card;
Find out the web-site of the manufacturer of the video/sound from yahoo or google;
Link to the web-site and searh for the model.
Download the driver from the company;
Re-install the driver or re-install the hardware;
Reboot the system if required;
Hope it works again;
Good luck.

自己整唔到咪攞去比電腦修理商整囉.