Cause - Windows XP Activation Data file may have been corrupted after trying to activate Windows or following installation of Windows updates
Below are troubleshooting steps for a Windows XP Product Activation Loop error. This error is not specific to Cybernet Units and the following steps were comprised of our own research and solutions found in other knowledge bases online. We have determined the following steps have worked best for most systems. Please note that it is best to turn off System Restore and similar tools to prevent restoration of the corrupted activation file.
1) Copy the wpa.dbl file (located in c:\windows\system32\wpa.dbl) from a working computer running the same version of Windows XP. Boot into safe mode and copy the known-good wpa.dbl file over the corrupted version. Reboot, and all should be OK again.
2) If not, go back into safe mode and delete the wpa.dbl and wpa.bak files, and reboot. The Activate Windows prompt will appear, but it should stick this time.
A) While in Safe Mode, go to Start and choose Run. Type "regsvr32.exe regwizc.dll" and press ENTER, then repeat and Type "regsvr32.exe licdll.dll" press ENTER. Reboot system into Normal Mode.
B) If all else fails, you must re-install the operating system to correct this issue.