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When programs are installed on your computer, they install configuration options into the Windows Registry and in files located on the hard drive. When you go to uninstall a program, these registry settings and files should be deleted, but there are always remnants left behind. These abandoned files and extra registry settings can slow down your computer.
A Registry and Abandoned file scanner can scan the registry and file system looking for remnants and properly remove them. My preferred tool to perform these options is CCleaner.
Make sure you take advantage of the option to perform a backup of the changed registry settings when offered.