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Hello all.. if u have problem with your laptop sound after install Windows XP SP2. Try below steps to fix it..

Step 1:
Please uninstall any audio drivers and Microsoft UAA (kb888111) if you install it.

Step 2:
this will open device manager
Click Start > Run... > type devmgmt.msc > press Enter
On Device Manager, please uninstall (right click > select Uninstall) a PCI device marked as unknown (e.g. with a '!' or maybe Yellow question mark)
then Restart your laptop.

Step 3:
After your laptop restarted,
Windows will ask you to install automatically the drivers for Microsoft UAA Bus.
Cancel it and install this kb888111 - Universal Audio Architecture (UAA) High Definition Audio (Download for XP SP2)
Restart your laptop

Step 4:
After laptop restart
windows will once more ask you to install automatically the drivers for Microsoft UAA Bus.
let windows install it automatically....
then please install the sound driver (e.g. Realtek Sound Driver)

Get it? If not please let me know.. thanks ya..