Hi,
1.] info for you 
%APPDATA% variable contains path to C:\Users\username\AppData\Roaming directory
%LOCALAPPDATA% variable contains path to C:\Users\username\AppData\Local directory
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Therefore I asked you to delete PTC subdirectory in C:\Users\username\AppData\Roaming directory.
2.] Creo Parametric 3.0 enables user to unpin dialog box from its tab (user can move dialog box to any screen location). I guess that you did such action and then saved customization file (creo_parametric_customization.ui). Maybe you moved dialog box to second monitor and forget about it ...
I did some testing and realized that "unpinned" status is saved in customization file (creo_parametric_customization.ui). So find this file (with .ui extension) and rename it (for example to creo_parametric_customization.ui.xxx).
The file can be saved:
- in your working directory
- in C:\Users\username\AppData\Roaming\PTC\ProENGINEER\Wildfire\.wf\.Settingsdirectory
- in CREO3_LOADPOINT\Creo 3.0\M060\Common Files\text directory
MH