Hi donb,
I am not sure what your issues are exactly.
but if you want to use vanilla AutoCAD, you can simply invoke from Start button -> Programs -> Autodesk -> AutoCAD Mechanical 2013-> AutoCAD 2013.
The express tool doesn't install by default in AutoCAD Mechanical so you need to add it by Add features from control panel.
Thanks.
Michael Su
SQA Engineer
Autodesk
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