1、Delete pimuninstall.exe from <User Profile>\AppData\Local\Temp (e.g. C:\Users\<Username>\AppData\Local\Temp\)
2、Open Bin directory in load point of Creo 2.0 (e.g. C:\Program Files\PTC\Creo 2.0\Parametric\Bin) > Press Right Mouse Button on uninstall.exe > Properties > Uncheck Read Only for Attribute under General Tab.
3、Uninstall program from Control Panel.