I had Build 1970 running with a Vista RTM VM and installed Cisco VPN 4.8.01.0590 on the Vista environment. Then I upgraded to Build 3036...everything worked great for a few days. Then the VPN wouldn't complete connections that I attempted so I uninstalled and reinstalled the Cisco client. Then the Vista virtual machine would just freeze at bootup - wouldn't get past the Windows launch screen with the status scrollbar. Allowed me to boot into Safe Mode in this one particular VM - but not in 2 subsequent Virtual Machines that I created to try to troubleshoot and figure out the problem. Common factor appears to be the Cisco VPN. Parallel Tools runs fine with VIsta. Is there a known issue with Cisco VPN, Vista, and Build 3036?