If you're using Windows 8.1/ 8, press Windows Key + X simultaneously and select Programs and Features. Click "Turn Windows features on or off" link on the left panel.
If you're using Windows 7/ Vista, click the Start button, type "Turn Windows features on or off" in the Search Box. Open that from the Search Results.
 This may take several minutes to uninstall the browser completely. Make sure all other applications are closed.
, This time check-up the "Internet Explorer" checkbox, and click OK. Make sure to insert the Windows installation disc in your DVD Drive.
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Open the Windows Features dialog box.
Uncheck the "Internet Explorer" checkbox, and then click the OK button.
Reboot your PC to successfully uninstall the browser.

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Repeat Step # 1 again.
After successful completion, visit the Microsoft Download Center and download the latest version of Microsoft Internet Explorer.

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Run the downloaded setup, and follow the on-screen instructions.
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