The ISA Server Packet Filter Extension Driver service failed to start

You see the following event after installing ISA Server 2000 on Windows Server 2003
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Event Type:�Error
Event Source:�Service Control Manager
Event Category:�None
Event ID:�7000
User:��N/A

Description:
The ISA Server Packet Filter Extension Driver service failed to start due to the following error: This driver has been blocked from loading.

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When you install ISA 2000 on Windows Server 2003, it automatically blocks ISA Server Packet Filter Extension Driver & the service fails to start.

When you install ISA 2000 on Windows Server 2003, it automatically blocks ISA Server Packet Filter Extension Driver from loading. To resolve this, install;
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ISA Server 2000: Required Updates for Windows Server 2003
http://www.microsoft.com/downloads/details.aspx?familyid=77d89f87-5205-4779-b1ab-fc338283b2d9&displaylang=en
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Or, Install Microsoft Internet Security and Acceleration (ISA) Server 2000 Service Pack 2. SP 2 includes Fixes that enable ISA Server to run on Microsoft Windows Server� 2003, Standard Edition and Windows Server 2003, Enterprise Edition.
http://www.microsoft.com/downloads/details.aspx?FamilyID=C8D3D98B-1CD4-406A-A04A-2AA2547D09A3&displaylang=en
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