A temporary solution... I have found that a "Repair" install (right click on .MSI, repair) allows me to connect with out uninstall > reboot. Not much of a permanent solution, but it works for now. I have a feeling we are going to have to wait for ...
I am having the exact same problem. Vista RTM, client 4.8.01.0590. I was able to connect on first boot, but not on subsequent boots. I have tried restarting Both Cisco and IKE services with no success. I get "Reason 442: Failed to enable Virtual ...