I have never really dealt with your particular issue, but I will tell you this for certainty, after all my years of messing with computers I have learned one thing, when you uninstall a program from your computer, it DOES NOT remove all files associated with the program. It may appear that it has to you because the icons and shortcuts are gone, but unless you go into the registry ( I do not recommend this unless you know what you are doing ) and delete every file associated with the program, then they are still there. And my guess is that when you installed the program again, it found those files and it just made them active again instead of duplicating the files. This is actually a good thing because your registry does not have a butt load of duplicate files.
I would suggest that you defrag your system after uninstalling and installing a program. This way all the files will be back together where they are supposed to be and the program will run faster.
Now you know...... And knowing is half the battle!
