MSDE and the install of I/NET Seven and Vista 4.3.1 version software.
Single computer with both I/NET Seven and Vista software.
MSDE and instance
MSDE does not allow an unnamed instance to overwrite a named instance of MSDE.
I/NET Seven MSDE installs at this time an "Un-Named" instance.
Vista 4.3.1 installs a "Named" instance.
The work around: Install I/NET Seven first then install Vista 4.3.1.
This will be corrected in future release of I/NET Seven.