Very few programs clean up themselves efficiently when you uninstall a program and thus there are remnants of programs you have uninstalled lying around your computer. You can run a Removal Tool of the product (if available) or It is a good idea to locate and remove these files manually.
Uninstallers frequently don't remove every trace of a program, so after you have uninstalled something you must then clean up the remaining files. Nearly all programs put one or more entries on the Start menu to enable you to run them and there may be just a single item or a folder that contains menu items and possibly sub folders and more menu items. You may find that one or more items are not removed and are still on the Start menu. This is common if you have changed the Start menu and have moved menu items around to organise them. Right click anything you don't want on the Start menu and select Delete to remove it. This moves it to the Recycle Bin.
Tip: Before you uninstall a program let the mouse hover over its menu on the Start menu and you will often see the path to the file displayed as a pop-up tip. It is common to have the program folder as a sub folder of the company folder. After uninstalling a program you should delete any folders and files that remain.
In Windows Vista and Win 7 there is a C:\ProgramData folder that contains data files created by programs in C:\Program Files, so open an Explorer window and check what the folder contains. Delete any folder created by the program you have just installed.
The C:\Documents and Settings folder (XP) or C:\Users (Vista and Win 7) is where programs store information such as data, configuration settings, temporary files and so on. Click Start, My Computer, the hard disk drive, then open this folder. There are some general folders, such as Administrator, All Users, Default User, and Guest, and then there is a folder for each account that has been created. You'll see your own folder with your own user name.
In XP, open each folder in C:\Documents and Settings and look in the Application Data folder, for example, C:\Documents and Settings\YourName\Application Data.
In Vista and Win 7, open the C:\Users\YourName\AppData folder (ignore the Application data shortcut which is only there for compatibility with XP programs running in Vista and Win 7). You may find a folder or sub-folder that was created by the software you uninstalled. It will be named after the company or program, or there may be a company folder with the program as a sub-folder. Delete it if you find one.
There is another Application Data folder in XP , but it is hidden and cannot normally be seen. You must make it visible so that you can check it.