Incearca:
Realtek AC97 Audio Codec Driver A3.97 (windows ALL)
http://drivers.softpedia.com/......A397.shtml
SAU
Realtek High Definition Audio Codec (Windows 2000/XP/2003)
http://download.cnet.com/......88584.html
Intra in Start ->Run->dxdiag -> click pe tabul Sound -> fa un print screen si posteaza-l aici.
Mai intai incearca asta -> Intra in Start -> Run -> services.msc -> Enter (ca alternativa - Control Panel -> Performance and Maintenance -> Administrative Tools -> Services) si acolo din lista alege "Windows Audio" -> vezi daca este pornit acest serviciu.