Step 7: Stick with the Program

Once you’ve installed a program on a Windows system, don’t rename the program’s directories or move its files from one place to another on your hard disk. If you do, your computer will likely lose track of key files. You can put your data files — the ones you create with the application — almost anywhere (although see Step 5). If you must change the location of an application or any of its subsidiary files, you should first uninstall the application and then reinstall it.

Never try to manually delete an application on a Windows system. Most applications make additions to system files when you install them, so it’s best if the application has its own uninstall program. If an application doesn’t come with an uninstall option, try the Windows 95/98/Me/XP /Vista Add/Remove Programs Control Panel. If the application doesn’t support the Windows 95/98/Me/XP/Vista  uninstall function, use a commercial utility such as PC Tools Registry Mechanic V8 or the most current version available.  

As the Windows uninstall utility is not always reliable about removing all the pieces of an application, you may want to use one of the commercial utilities in all cases. They do a better job.