Reinstalling 14.04, but leaving files/apps intact

[AFJ Headquarters]

Hello, Tony here.

If you guys have noticed, I've installed Xubuntu, then uninstalled it, 
but traces of it still remain.

And they really annoy me.

I've decided to reinstall Trusty Tahr, but I want to know if there is a 
way to reinstall but leave files /and /apps (Dansguardian, Wine, Mozilla 
Thunderbird, etc) intact. I don't want to have to re-configure 
Dansguardian (/that /was a lot of work), re-do Mozilla Thunderbird, or 
reinstall Wine.

I don't know if such a method exists in the world of Ubuntu, but I'm hoping!

Any suggestions?

Tony
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