HP Compaq dc7900 Small Form: product key

When I got to my pc that I typed in my product key and it worked, then a few months later, I refreshed my pc because of the hardware function say and my product key has not worked since then... it happened last year on October and I get a black background and a reminder on my product key is not working. I have a windows 7 Professional (32-bit operating system) and a product key that doesn't quite work (more like the invalid product key) I re typed several times but it does not work please help me

I got a virus and I re booted my hard drive and then my computer has red lights next to the switch so I had to change the hard drive

Tags: HP Desktops

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