Here is the recovery procedure from the HP web site

Using the Recovery Manager
The recovery manager helps you recover your factory shipped computer programs and drivers should you experience a computer failure or instability. The recovery manager can be accessed by either of the following:

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Click Start and start typing recovery in the search field. Select Recovery Manager from the list provided.
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Recovery Manager is also accessible by pressing F11 during boot and allows users to recover the factory preinstalled image.

The recover manager allows you to perform the following by selecting the Yes button and then the Next button on the appropriate screen:

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Software program re-installation:
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If you select Yes and Next , you will see a software re-installation screen that helps you reinstall software that was included with your computer. Select Next and you will be provided a list of programs and be asked to choose which program you wish to reinstall. Follow the onscreen instructions.
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If you select No and Next , you will be asked if you want the following:
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Hardware driver re-installation:
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If you select Yes and Next , you will see a hardware driver re-installer screen that helps you reinstall hardware drivers that were shipped with your computer. Select Next and you will be provided a list of drivers and be asked to choose which driver you wish to reinstall. Follow the onscreen instructions.
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If you select No and Next , you will be asked if you want the following:
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Microsoft system restore:
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If you select Yes and Next , the Microsoft System Restore requires you to leave the Recovery Manager and by selecting Next , you will be forwarded to the Windows System Restore program. Follow the onscreen instructions.
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If you select No and Next , you will be asked if you want the following:
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Recover your computer to its original factory condition:
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If you select Yes and Next , your computer will automatically start the shutdown procedure and reopen in the System Restore program. Be sure you want to completely restore your computer to its initial factory settings before proceeding. Otherwise select cancel.
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If you select No and Next , you will be provided information for contacting HP Support. Clicking Finish will close the program.