After you install the MS03-026 security patch on Windows 2000, your desktop is blank.
This problem will occur if the %SystemRoot%\Registration\R0000000000e7.clb file has 0 bytes.
To workaround this problem:
1. Press CTRL+ALT+DEL.
2. Press the Task Manager button.
3. Select the Applications tab.
4. Press New Task.
5. Press Browse.
6. Navigate to %SystemRoot%\Registration and Delete the Registration folder.
7. Press Yes to confirm.
8. Shutdown and restart you computer.
A new Registration folder is automatically created.
NOTE: If you have other computers to repair, just copy the contents of the new %SystemRoot%\Registration folder to the other computers.