Step 1: Click on Start >>> type "services.msc" (without quotes) in Search for programs and files field. Open Services (as shown below), a new window will open now showing all services on your PC.
Step 2: Scroll down to "Windows Update" in services >>> Right click and click "Stop" to stop the services.
Step 3: Locate C:\Windows\SoftwareDistribution\ folder and delete all the contents in this folder.
Step 4: Restart "Windows Update" service in services by Right clicking >>> Click Start
Try Windows Update again by going to Start >>> Control Panel >>> Windows Update or by simply typing Windows Update in Search for programs and files field.
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