Windows 10: reactivating win 10 failure

dear fellows

i have this hp laptop which came with win7 which i registered later i was granted win 10 which worked well for a year then i lost my setup .now i have my win 7 back and went for the upgrade which i downloaded with difficulty form Microsoft .a

i fail to register win 10 this time i tried trouble shooter and made many attempts all fail please help i have

e this error code OX87E10BC6

this is my second trail here

:)

 

Fresh Install of Win 10 without Serial Key?

Looking to reformat a laptops HDD, and then reinstall Win 10 fresh. The problem is it came pre-installed with Win 8 and I did the free upgrade to Win 10. How exactly would I re-format the HDD, reinstall Win 10 and ensure it reactivates properly? I don't see a Win 8 serial key anywhere in the contents of the box.

 

Error Message when updating from Win-7 to Won-10

Bree
I followed your suggestions (2nd Aug 19) for installing Win-10. Made the bootable flash drive successfully through the media creation tool. But when I attempted to upgrade and activate to Win-10 (64 bit) from within Win-7 (Pro-32 bit), I got the following error message:

Error # OxC1900101-Ox20017. " The installation failed in the SAFE_OS phase with an error during BOOT operation"

I read the diagnostics under this error number and carried out the proposed fixes, i.e. update Win-7, uninstall Malwarebyte antivirus, disconnect all external hardware, e.g. printer, scanner, external hard drives. I then tried to repeat the steps to do the upgrade through the Win-10 bootable flash drive as before. Got the same error message.
Appreciate any further comments and suggestions as to (a) what does a failure in the SAFE_OS during boot operation mean, (b) what can I do to solve it. Is this anything to do with the hardware in my computer? I listed these in my first posting above.
Thanks for any help

 

Another Win 10 reactivation issue.

That’s fine, you’ll see this if the pc wasn’t upgraded to Win 10 from another version.

If Microsoft won’t accept the order number or anything else then you’re limited. It may be that you’ll have to phone again in the hope of getting a more helpful operative.

Did you do this before the hardware change?

https://support.microsoft.com/en-us/help/20530/...

I’ll provide further suggestions of which you’ve probably already done:

https://support.microsoft.com/en-gb/help/20530/...

Some suggest switching to a local account, using the default key then switching back to a MS account has worked for them.

I’ll keep checking.