After Installiing VIPRE 4.0  Enterprise, Cisco VPN connection does not work.
The  VPN connection can be made (to firewall). but no  traffic was allowed thru VPN Tunnel.

To resolve this  Open the control panel and Open network connections. Right click on the Local Area Connection 2 or similar that it for  "Cisco System VPN Adapter" and click properties
In here uncheck the "Sunbelt Software Firewall NDIS IM filter"  Then click apply. You may reenable Firewall in VIPRE after this.