If you no longer need a program on your computer, or if it is conflicting with other programs on your system, it's a good idea to uninstall it. Most of the time, the program's uninstaller will be adequate for this. You can find that by looking for the installer file, and then selecting "uninstall." This should remove all of the files associated with that program. There may be many other programs that wound up getting installed on your system that you're not even thinking about, and are just taking up space or resources.
The internet has always been an incredible resource for information, but if you're motivated enough, you can take that a step further and get a free or inexpensive college education. MOOCs, or "Massive Open Online Courses," are real classes that have been made available online from schools and universities. Many of these courses are free, but if you decide to pay, you can actually get a certificate of completion or a MicroMasters from it. Here are some of the places you can find these MOOCs:
Mary has Windows XP and she needs to reformat her hard drive, but she has programs she can't replace. Leo says that she can look through her registry to find software keys so that she can reinstall them to reactivate them. But if she doesn't have the reinstall disks, she may be out of luck. That's why having an image of the hard drive is very beneficial.
Mike wants to know how to find all of the files installed by a program so he can remove them after he uninstalls that program. Leo says that the best way to uninstall a program is to use the uninstaller that comes with the program, or use the Windows 'Add/Remove' programs. Ideally the uninstaller should look at the manifest created by the installer and remove all traces. Sometimes those uninstallers aren't well done and it leaves some traces behind.