I have been using Vegas Pro 10 without incident. Finally, I went to install the version 11 that I bought as an upgrade when it was first released, but I get this error:
"ERROR: 1603 occured during installation
Could not create key: \.ogg\vegas110_ogg\ShellNew. Verify that you have sufficient access to that key, or contact your support personnel."
I have tried rebooting, disabling antivirus, installing as Administrator, installing from DVD, installing from most recent downloaded file -- nothing works.