A programme I have just stated to experimemt with is Ashampoo Magical Uninstall -Look at the menus on their home page.
The freeware programme is pretty clever. It makes a list of files and registry entries before and after installing a programme, then compares the two to make a file logging the changes made, which it saves, and can then use the information to remove or change back all files or entries if you decide to uninstall. Many programmes leave behind a stack of junk when you uninstall using usual methods, but this one is more clever. It even gives the option of saving the uninstallation, so you can use it to reinstall the same programme at a later date.
I only installed it this week, so am still evaluating it, but so far it seems really useful.
The pay money version also allows you to add information about updates to programmes, so they can be included with the original install log.
Quack!
GtD.