Seems that the Cisco VPN client is always causing issues. I found a cool page today about cleaning up and upgrading the DNE or Deterministic Network Adaptor. Basically this tool allows (cisco) to find out which adaptor in your computer is currently attached to a network and not use the others.

so with out further.. http://www.citrix.com/lang/English/lp/lp_1680845.asp

make sure to take note of the winfix tool to clean up the existing DNE problems

And no this will not help with the Cisco VPN client and windows x64 bit issues. Cisco no longer supports the good old IPSEC client in 64 bit (actually no major vendor supports that) they have all gone to SSL VPN, in the case of Cisco you need to look at the AnyConnect Client. And no it wont connect to the 3000 or 5000 VPN concentrators. You need to buy a new ASA 5500.

However never loose hope http://www.shrew.net/download/vpn has created a client that will work for you, and if you landed here because you just cant get Cisco Client working.. use that one!

Other things to note that the AnyConnect Client isnt a GRE.IPSEC tunnel that means that if you use UDP your packets are converted to TCP for the SSL protocol. If you care, Juniper SSL VPN technology is the best of it all. The IVE or SSL appliances will connect with what they call AnyConnect  it will try and use GRE first then fail back to SSL if it cant do it.

Happy Networking.