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Error code: 0xC004C003 Windows 8.1 on HP Envy 15 Notebook

Update:10-11Source: network consolidation
Im looking for a solution to a invalid product key
I bought the computer approx 18 months ago and it shipped with windows 8
I updated to windows 8.1 straight after purchase with no problems, about 3 months ago I started to have problems with computer locking up and running slow, so I performed a fresh install from the back up drive. I then had to dowlnload a huge list of updates before putting windows 8.1 back on
I then got the message that I needed to activate windows ( Error code: 0xC004C003)
I contacted HP and was given a new activation key - This worked perfectly
I then started to have computer problems - (computer would not enter sleep) so I performed a refresh of windows, again I had to spend a long time installing updates and  windows 8.1
I got the same activation error - so I contacted HP to be told they could help (dont know why when they helped previously) and was advised to contact Microsoft with the installation ID so they can reactivate windows
I contacted Microsoft to be told that I had an invalid product and should contact HP
I have tried the phone number again and the message says the help centre is unavailable
So I am trying here   
Any solutions other than getting a new product key ?
I have updated the Bios and downloaded all available updates, computer seems to work fine other than it thinking I have an invalid copy of windows.
A web search seems to reveal that this is a common problem!

The Best Answer

Hi @Mark2222 ,
I have brought your issue to the attention of an appropriate team within HP. They will likely request information from you in order to look up your case details or product serial number. Please look for a private message from an identified HP contact. Additionally, keep in mind not to publically post ( serial numbers and case details).
If you are unfamiliar with how the Forum's private message capability works, you can learn about that here.
I work for HP