http://www.bios.net.cn/down/PCsoft/187.html
版本老了点, 但还能用.
厂商主页有新版本下, 但好象只能用30天, 应该够了.
http://www.lavalys.com/
在EVEREST里检测一下所有PCI的物理DEVICE, 可以找到REALTEK声卡的型号. 新机器一般都是ALC88x series. The driver works for all the devices.
As to windows update, you should be able to download a Dell OEM XP Pro SP2 CD image (baidu, not google).