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download hp diagnostic core dll where do i go url?

HP Recommended
Microsoft Windows 8.1 (64-bit)

had to refresh my lap-top and Microsoft had removed: hp diagnostic core dll - I googled the file name but I could not download it. So where do I go to download it?  - hp diagnostic core dll   - I also tried the HP site but I cannot find the model number of this laptop - it is 5 yrs old.  thanks for any help.   operating system: windows 8.1, 64 bit -  Larry 9119 

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HP Recommended

HP PC Hardware Diagnostics Windows is a Windows-based utility that allows you to run diagnostic tests to determine if the computer hardware is functioning properly. The tool runs within the Windows operating system in order to diagnose hardware failures. HP PC Hardware Diagnostics Windows comes pre-installed on new HP computers, but if not on yours, download here:-


Or something else?

Make, Model and OS please.
SKU: if possible by this method
WinKey + R and type
Read Line 9
System SKU: N6K07EA#ABU

Please do not post Serial Numbers.



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