1. Your SQL needs to be Windows 2012 R2 Server / SQL Server 2012
2. Before starting any work on your environment please ensure that you have a recent backup of your database.
3. Upgrade Network Performance Monitor from version 12.1 to version 12.2
4. Upgrade NetFlow Traffic Analyzer from version 3.11 to version 4.2.2 (First NTA Server first then do the Main Orion Server)
Resource: SolarWinds Product Upgrade Advisor
Note: During an install or updates of your SolarWinds products, SolarWinds recommends that you Login to your Orion systems with the local Administrator account (do not use a Domain Admin account) to avoid GPOs and any other potential permission issues OR right click the App and "Unblock" then right click and Install as an Administrator.
How about processor utilization on the SQL and NTA servers?