You've just turned back on your computer and suddenly you
can't get into the desktop. It gets stuck in the Windows log-on screen.
And what's pretty surprising about it, the activation screen comes up
and would ask you to activate again your Windows XP.
What
you would normally do is to activate the product hoping you could
log-on back to the desktop. Unfortunately in most cases, the activation
will not work. And in some other cases, when you activate the product,
it would tell you that it is already activated but does the same anoying
thing after a restart.
Here's
the fix that I've tested in quite a few Windows XP system. This works
on either Windows XP Home or Professional. Just follow the steps in
order:
- Start your computer in safe mode (use plain safe mode).
- Login using an administrator user account. If you could login to the hidden Administrator account, then use that.
- Go to Windows Start menu and open RUN. Or you can press on your keyboard the Windows key and letter R.
- Type CMD in the run textbox and click on OK. This will open the command prompt window.
- Type these commands and press enter. Then click OK on each prompts :
regsvr32 regwizc.dll
regsvr32 licdll.dll
- Type this last command (type exactly as what you see here):
rundll32.exe syssetup,SetupOobeBnk
- Wait
for a couple of minutes because the last command will not show anything
on the screen. However, it will reset the licensing components in the
background.
You may now restart your computer and you can log-on back to your normal Windows desktop screen.
Source: http://troubleshooting-101.blogspot.com/2012/02/windows-xp-activation-loop-cant-log-on.html#.WO-uKqLauUl