cant get VPN to work with VISTA and 1Care

I cannot get vpn to work with Vista Home Premium and One Care. It used to work before I installed OneCare. If I deactivate the One Care Firewall it still wont work. I have enabled VPN in One care. Interestingly when it fails and comes back with the user/password dialogue the password has doubled in length for the second attampt. I have another computer with Vista but no One care and have no problems

Hope someone can help