XP SP2 can not active

Hi!
I apologize vos xp is not for this forum but I'm in trouble and maybe here is someone who can help with this old OS.
Suddenly today morning I got the screen to activate the windows and no more possibly to login.
When I try to activate then I got a screen like it is activated but still cant log in.
And I'm looping through the same "need to activat/activated" but no progress in solving the problem.
I tried all solution I found on the net.
The windows is an original and I also have te original sticker with the key, but that didn't helped mi forward.
The OS was working for 15 years or maybe longer.

Is there out any app maybe or a solution how to completely remove this activation stuff?

I tried to tweak the registry and all that thinks to turn back some activation time etc but no success.

Any help I would really appreciate.

Thanks for your time.
I tried everything like these from the links, without success.
What I can't understand why this happened without any alert before.
Again a microsoft bug probably...

EOF said:

Thanks for your time.
I tried everything like these from the links, without success.
What I can't understand why this happened without any alert before.
Again a microsoft bug probably...

If you changed the motherboard it will never work.

EOF said:

Thanks for your time.
I tried everything like these from the links, without success.
What I can't understand why this happened without any alert before.
Again a microsoft bug probably...

Even the phone activation did not work ?

MaloK said:

Even the phone activation did not work ?

I was just going to ask that. Also check and make sure the date is current on your computer. Known to cause this very problem.

The phone number is outdated.
Here is what happened:
After soooo many time of restarting, hacking, tweaking etc. suddenly I got a msg I have 3 day to activate.
So, after that I could login to the account and follow some of that tweaks you mentioned here and now, I hope, the activation crap is ended.

However thanks for everybody for helping.

Easier solution is to use Windows 10 and install XP in a Virtual Machine. How To Activate Windows XP Now That Support Has Ended? | Yoodley