About the DVD, dedicated software can be found on the internet to test file integrity in CD's / DVD's.
However Webster's advice may be spot on, it was my thought exactly: leftover files that need to be removed manually, and registry cleaned.
There is plenty of free software online. I use Advanced System Care (free version) which performs these two operations (and many more btw): regular uninstall followed by a leftover clean-up (advanced), and registry cleaning.
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