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A problem is preventing Windows from accurately checking the license for this computer. Error code: 0x80070002

Reset the default security provider in Windows XP

To reset the default security provider in Windows XP, delete the relevant registry keys in the Windows registry. To do this, follow these steps:

  1. Start the computer. Press the F8 key during startup to start the computer in Safe mode.
  2. Start Registry Editor (Regedt32.exe).
  3. Delete the following registry keys in the Windows registry:
  4. HKEY_USERS\.DEFAULT\Software\Microsoft\Cryptography\Providers HKEY_USERS\S-1-5-20\Software\Microsoft\Cryptography\Providers
  5. Quit Registry Editor.
  6. Restart the computer.
Reset the drive letter of the system drive

Use Registry Editor to change the drive letter of the system drive back to its original value. Edit the following registry key to change the value of the system drive:
HKEY_LOCAL_MACHINE\SYSTEM\MountedDevices
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