If you are asked to enter a product key during the installation process, use this generic key.
This is the generic key for W8.1 'standard.'
If you had to enter the generic key, manually change the generic product key to the W8 'standard' key in your PC's BIOS in the PC settings menu.
After you get W8.1 installed, and you had to manually enter the generic product key, you will need to run the free utility I zipped up and attached below, that will show you show the W8 product key in your PC's BIOS.
I have also zipped up and attached below, the Microsoft tool which hopefully will transfer the ISO file to a DVD or usb flash drive so it is bootable.
Then you can install the available drivers and software from your PC's support page.
Be alert for scammers posting fake support phone numbers and/or email addresses on the community. If you think you have received a fake HP Support message, please report it to us by clicking on "Flag Post".