Microsoft ISA Server Control Service failed to start because the operating system service Routing and Remote Access is already running. To fix this problem use ISA Server setup to reinstall ISA.
This error is caused by an improper configuration in the Routing and Remote Access service. The service must be made dependent upon Microsoft ISA Server Control service. To do this you must edit the Registry in the key “HKLM\System\CurrentControlSet\Services\RemoteAccess” and add "isactrl" in the “DependOnService” value.
From a newsgroup post: "The error occurs if upgrading W2K to .NET, without uninstalling ISA first. Un-installing ISA and then reinstalling it solved the problem".
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