1. Install VPN Client 5.0.4.0300. (or above if a newer version is available) Do not reboot yet.
2. Install the Citrix DNE update. Do not reboot yet.
3. Take ownership of %windir%\system32\drivers\ndis.sys
4. Delete %windir%\system32\drivers\ndis.sys
5. Reboot. System will try to fix itself. Leave all defaults and allow it to repair.
6. Reboot again and login.
7. Restart the Cisco VPN client service.
8. Connect as usual.
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