I also installed over a long period the following programs on the same pc and could easy uninstall them to re install a upgrade.
Acrobat reader
Microsoft office
Winavr(programmers notepad)
Atmel studio
RADIO PROGRAMS:
Kenwood
Motorola
Mototurbo
Icom
Hytera
Vertex ... mention only a few that comes to mind.
I did not even know that there could be a problem to remove all the files after a uninstall.
Until now when I uninstall Arduino and want to install a upgrade.
By the way my post is still on page 1 and you did not read it I did mention my post ..AVR G++ FILE NOT FOUND...not clear enough....to complex...YOU DID NOT READ THAT POST!!!