To echo the preceding post ... you should always, first, uninstall what you want to replace, doing it cleanly and with an uninstaller if possible. Then, IMHO, you should reboot the machine. Only now can you feel reasonably confident that nothing is lingering around in memory and so-on. Now, install the new software. If all that you do is to “delete the old directory,” there is unfortunately an excellent chance that many other critical things are not cleaned-up, e.g.: DLLs in Windows system-directories, and particularly, system registry entries. (Windows, far more than Linux, is ruled by a central database ... the registry. It is both a blessing and a curse.)
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