XP Activation Screen after successful activation

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After a normal boot, I enter password for an administrator account, password
is successful. I am then presented with an error message that says 'Windows
Product Activation This copy of Windows must be activated with Microsoft
before you can log on. Do you want to activate Windows?' Answering 'no'
logs me off. Answering 'yes' brings up new dialog box. 'Windows Product
Activation - Windows is already activated. Click OK to exit.' Clicking OK
then logs me off. How do I correct this problem? Windows XP will boot to
safe mode successfully.
Thanks.
--
jackp
.

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