I have updated the details in the case. The same i am updating here also.
Kindly find the details of our system.
1) For Insite 3.x NOT using Powertech Antivirus (PTAV): We are using Symantec Endpoint Protection
2) 8 GB RAM: We have 16 GB Ram on server
3) 10 GB free space: We have more than 30 GB free space
4) 4 CPU: We have 4 CPU on our server
5) Windows 2012, 2012 R2 or 2016?: We are running on Windows 2016