You may receive the subject error, if Windows 2000 incorrectly reads the digital signature and the local policies for Unsigned driver installation behavior and Unsigned non-driver installation behavior are set to Do not allow installation.

To work-around this issue, temporarily set the polices to Silently succeed, when updating a driver or installing a service pack or hotfix:

1. Start / Run / MMC / OK.

2. Press Add/Remove Snap-in, on the Console menu.

3. Press Add and select Group Policy and press Add.

4. Press Finish / Close / OK.

5. Navigate through:

    Console Root
    Local Computer Policy
    Computer Configuration
    Windows Settings
    Security Settings
    Local Policies
    Security Options

6. Right-click Unsigned driver installation behavior and press Security. Toggle the Local policy setting to Silently succeed and press OK.

7. Right-click Unsigned non-driver installation behavior and press Security. Toggle the Local policy setting to Silently succeed and press OK.