Sometimes apps can misbehave due to missing or corrupt files. Windows makes it easy to repair a program installation when this happens or even to uninstall the program from your system entirely if you’re no longer using it.
Repairing a Program
Repairing a program works by checking all the files in the program’s folder, replaces any that need fixing, and may even check/fix entries in the Registry. It runs through the program’s installation again but tries to preserve any settings you’ve made.
Using the Control Panel
Hit Start, type “control panel” into the search box, and then click the result.
In the control panel window, click on “Programs.”
Next, click on “Programs and Features.”
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Source: How-To Geek
