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i have reboost my laptop but it says the computer restarted unexpectedly or encountered an unexpected error. Windows installation cannot proceed to installed windows click ok to restart the computer and then restart the installation. but eveytime i press ok the little window keeps showing up with the same thing

This could be either a hard drive problem or memory problem. If you can access the internal diagnostics by pressing F2 when you see the HP splash screen, select the component menu and select hard drive or memory. There may be a fast test and a more intensive test for the hard drive or the memory, it is better to use the intensive tests. If the tests work OK then the problem may be the medium you are using to install Windows is corrupted.