I have the same issue with a single computer. But I tried run the SAPlogon as admin and doesn't work.
Is a strange error; I used the code to connect to SAP in more than 100 computers and all have a similar configuration.
This is the error:
Cannot create ActiveX component.
SOURCE = Microsoft.VisualBasic.Interaction.GetObject
This is the specific line when the error is raise:
SAPgui = CreateObject("SAPGUI").GetScriptingEngine
Windows 7
SAP 7.20