My product is HP 15-g000 Notebook PC series and I contact microsoft and they said to contact hp. I am facing windows activation error and my error code is 0x8007007B and it shows that contact system administrator. My warranty is over. Please help.
You are running Windows 8.1, the key should be on the bottom of the OEM laptop or back or top if desktop. It is also possible you typed it wrong. Microsoft (on purpose) makes a B look like and 8 and a ZERO 0 look like the letter O so look carefully.
If you bought the software off the Internet it could have been an Enterprise Key, which means it was issued to a major business and someone stole it and sold it, Sometimes you can get it to activate but then MS will kick it out later.
If you can please let us know if the key came with the system and is stuck on the system.