Hi, thank you for your forum post and sorry that you have encountered a problem.
The errors you are experiencing are being generated from Windows .Net.
I suspect that you may need to repair or reinstall / install .Net 3 or .Net 3.5 SP1. I quote from your post:
Unrecognized configuration section system.serviceModel. (C:\\Windows\\Microsoft.NET\\Framework\\v2.0.50727\\Config\\machine.config line 134)
I believe system.serviceModel is WCF introduced in .Net 3.
The SQL Backup V6 GUI requires .Net V2, which may mean that you need to remove .NET 3 and reinstall .NET V2 framework.