Somehow WinXP can't handle your hardware in a right way, but I guess you knew that much already. I don't understand, since you say this problem orrurs since you installed SP1. Weird.
You might try an BIOS upgrade, these usualy fixes such problems; you not the only one experiencing the problem, I expect more people do. So it's likely that some fix is available by now.
If even an BIOS upgrade doesn't fix this, you might wanna try something silly; in your bios disable ALL P&P and Power Management setting, and reinstall Windows. Windows won't understand Power Management, and will install without ACPI support.
You have to turn off the machine manualy everytime you choose to shutdown though . . .
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Several security vulnerabilities in Firefox and the Mozilla Suite of Internet software put users of the open-source products at risk of hacker attacks, the Mozilla Foundation is warning.
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