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The Windows 2000 operating system did not support 16-bit PCMCIA access for the O2Micro Cardbus Controller for any OEM installation before the release of Windows 2000 Service Pack 4. If the Windows Device Manager shows the installation of an O2Micro Cardbus Controller under the PCMCIA Adapters device class, and the System Properties dialog box shows a Microsoft Windows 2000 Service Pack prior to SP4, you must update your operating system to the latest service pack available from the Microsoft operating system downloads/updates Web service.