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If you think this is a driver issue, please try Where do we see HPDiagnosticCoreUI.exe ? Let try to run a system scan with Speed Up My PC to see any error, then you can do some other troubleshooting steps.
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What can you do to fix HPDiagnosticCoreUI.exe ? If you encounter difficulties with HPDiagnosticCoreUI.exe, you can uninstall the associated program (Start > Control Panel > Add/Remove programs Let try the program named DriverIdentifier to see if it helps. Is HPDiagnosticCoreUI.exe using too much CPU or memory ? It's probably your file has been infected with a virus. Something wrong with HPDiagnosticCoreUI.exe ?
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