The installation adds two entries in Add Remove Programs, one is Caterpillar Electronic Technician 2012A and other one is Caterpillar Comm Adapter. 

Caterpillar Electronic Technician 2012A

uninstall is simple with Msiexec /x {Product code}

Caterpillar Comm Adapter

uninstall is  "C:\Program Files\Caterpillar Inc\Comm Adapter 3\Uninstall.exe /S (Capital Only)".