I've observed a case on Windows Server 2008R2 where an antivirus product called ESET Smart Security prevents install of the TAP driver.

The net effect in tapinstall (devcon) is that UpdateDriverForPlugAndPlayDevices returns error code 1450 (ERROR_NO_SYSTEM_RESOURCES).

Apparently ESET interferes with other VPN clients as well:

http://social.technet.microsoft.com/Forums/en/w7itpronetworking/thread/f92abbdf-a340-4629-a46c-f186f7c82340

James

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