Completely uninstall a computer program

Revo Uninstaller does a pretty good job, better than most tools I have tried.

The best way to remove all traces though is to have an uninstaller already on the system that will monitor the initial software installation. Because it monitors the changes made during the install, the removal process is more complete, but in some cases it still won’t be perfect since some software will add or change more registry keys on its first run.

If you have already uninstalled the software from the computer, you can use regedit to look under HKCM\Software\\ (if they followed MS conventions for their registry usage) and delete the entire branch after exporting it to a .reg file (in case something goes wrong). This may not get everything the program put in to the registry, but it will dump all of the program specific items. Running a registry cleaner after this will generally turn up more items that were dropped into HKCR (primarily file associations) and common or shared file references.