in Service Pack 4 (SP) run Microsoft Windows Server 2003, Microsoft Windows Storage Server 2003 or Microsoft Windows 2000 on the Server, you try to install Microsoft SQL Server 2000 by volume licensing agreement (VLA) media. To perform this operation, the following error message appears SQL Server setup wizard CD KEY page:
unable to verify the product KEY


warning if you modify the registry incorrectly by using registry editor or use another method, may be there will be a serious problem. These questions may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve these problems. Modify the registry needs you at their own risk.

if you want to solve this problem, follow these steps:
1. In SQL Server setup wizard, click cancel.
2. Start the registry editor. To do this, click start, click run, type regedit, and then click ok.
3. Find and double-click the SafeDllSearchMode registry entries.
running Windows Server 2003 Server or Storage Server 2003, this registry key is located under the following registry subkey:
HKEY_LOCAL_MACHINE \ SYSTEM \ CurrentControlSet \ Control \ Session Manager
with SP 4 a Server running Windows 2000, this registry key is located under the following registry subkey:
HKEY_LOCAL_MACHINE \ SYSTEM \ Control \ Session Manager
note that if the SafeDllSearchMode registry keys do not exist, create SafeDllSearchMode registry entries as a DWORD value.
4. Numerical data in the frame, the value from 1 to 0, and then click ok.
5. Quit registry editor.
6. Reinstall SQL Server 2000, and then install the latest SQL Server 2000 Service Pack.
7. Restart the server.

concise version:
under the environment of the above applies SP1 and sp2, install SQLServer2000, originally don't need to input CD - need to input the KEY place, and also suggests "unable to verify the product KEY".
solution (Microsoft's official solution) as follows:
to cancel the install and open the registry editor. In registry key HKLM \ System \ Control, Session Manager, browse the SafeDLLSearchMode key, this key is DWORD value, the value from 1 to 0. If the key doesn't exist, create it. Installed after the restart is essentially and continue to be used, can solve the problem.

actually installed are used to security issues that need to be resolved. Detailed setting method can refer to the

Win2003 MSSQL with ordinary users run Settings

is essentially normal user operation error solution added

This concludes the body part