Were you trying to download using the online or offline installer? Using the online installer can lead to a corrupted installation...try the offline. When you click to download LW & a dialog box pops up asking if you want to save the file, cancel that. Now use the option to download the offline installer.

Might also check Java...
Try updating your Java: Java SE Downloads
Before updating, go to Start > Control Panel > Add/Remove Programs. Now Delete ALL versions of Java you find. Now Download the JRE Offline installer

Hope this helps.

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