I bought a refurb system directly from Dell.  I've had issues with the system, but long story short, it was shipped with no OS loaded.  I was sent a disk with the appropriate OS - the system was advertised as coming with Win 7.  As soon as I got Win 7 loaded, I performed my free upgrade to Win 10.

However, I cant get the license activated.  I get this error:

Error Code: 0xC004C003
Error Description:  The activation server determined the specified product key has been blocked

I'm not an expert, but it sure seems like I didn't get a legitimate copy of Windows...  Can someone please advise?  I'm getting a bit upset and do not feel I'm getting what I paid for... and really upset if a company like Dell cannot provide me with a legitimate product key.