Check that your SQL instance is not part of any existing applications SQL instance that may be denying permissions to create the databse tables for vRanger.
If you find/know that another application has already an instance in SQL installed previous to vRanger then you have the following choices to resolve:
Example: 3rd Party app is on SQL 2005 (x86) and you need to install vRanger 7.x on SQL 2008 R2 (x64)
Download and install SQL 2008 R2 (x64) createa new instance, then install vRanger using the new SQL install you created This way the other app can continue working on the 2005(x86) and coexist with vRanger on the same box