SP1 is being distributed gradually by Microsoft, and will be available first in English, French, German, and Spanish. Other languages will become available over time. Continue to check back in Windows Update if you require support in other languages.
Before displaying the option to download SP1, Windows Update verifies that all of the required drivers and updates are installed on the computer. If the drivers are older than the specified version, Windows Update prompts you to install updated drivers to meet the current requirements.
You might need to run Windows Update and restart the computer multiple times before the Windows Update completes installing SP1. HP also recommends that you run the HP Support Assistant multiple times as you run the Windows Update.
Only when the Microsoft Windows Update has verified that the required updates are installed and working does it display the SP1 Update option.
For more information on why your computer is not displaying SP1 in Windows Update, please refer to the Microsoft web site.