Correcting "Another version of this product is already installed" error in Windows

Sometimes the softwares are not uninstalled properly and when you try to reinstall them on windows, you get the error -
"Another version of this product is already installed.  Installation of this version cannot continue.  To configure or remove the existing version of this product, use Add/Remove Programs on the Control Panel"
 To correct this error, do the following -
Step 1: Execute the following command from the command prompt:
         msiexec /i <ApplicationName>.msi /lv logfile.log
where the application-name.msi file is the setup of new version.
/lv is log Verbose output.
msiexec - Provides the means to install, modify, and perform operations on Windows Installer from the command line.

Step 2: After executing this command, it will try to install your software and also generate a log file of the installation steps. If any error occurs, you can see it in the log file. The main aim of generating this log file is to get the GUID of the product you are installing. It will look something like this - X2X90X73-3D6A-4195-B3D5-8B570394FB5F}. Copy this code from the log file.

Step 3: Execute the following command from the command prompt/visual studio command prompt -
            msizap.exe TWP {copied GUID}

Msizap.exe is a command line utility that removes either all Windows Installer information for a product or all products installed on a computer.
T - This flag removes all the information for the specified product code. When using this option, enclose the Product Code in curly braces.
W - Removes windows installer information for all users.
P -   Removes the In-Progress key.

Now your product has been completely removed and you are ready to begin the fresh installation of the software.