I upgraded from XP to Win 7, so if you are running Vista, this might not apply.
Install Ventrillo in Windows 7, then copy from the Users down in the Ventrillo2.ini on the old location and paste it at the end of the new file.
Windows XP
C:\Documents and Settings\USERNAME\Application Data\Ventrilo
Windows 7
C:\Users\USERNAME\AppData\Roaming\Ventrilo
Remove the following line from the new file.
VetFile=C:\Documents and Settings\USERNAME\Application Data\Ventrilo\default.vet
Install Ventrillo in Windows 7, then copy from the Users down in the Ventrillo2.ini on the old location and paste it at the end of the new file.
Windows XP
C:\Documents and Settings\USERNAME\Application Data\Ventrilo
Windows 7
C:\Users\USERNAME\AppData\Roaming\Ventrilo
Remove the following line from the new file.
VetFile=C:\Documents and Settings\USERNAME\Application Data\Ventrilo\default.vet