I have Acer Extensa 4220. I have Acer Extensa 4220 Laptop with the following specifications:ACER

Question

I have Acer Extensa 4220 Laptop with the following specifications:ACER Extensa 4220 laptop:Intel Celeron Processor 540(1.8 GHz, 533 MHz FSB,1 MB L2 Cache)512 MB DDR2 (Added another 1 GB)Audio: card: Intel High Definition Audiochip: Realtek ID 268I installed Win XP SP2 and every thing is o.k. the sound is playing but the quality is not o.k. and there is glitches and noise how can I fix te problem