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By | November 2, 2012
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Problem is often caused by Google Chrome being uninstalled. Fixed it by following the final step listed at http://support.microsoft.com/kb/310049

Verify that the String (Default) value of the “HKEY_CLASSES_ROOT \.html” key is “htmlfile”

  1. Click Start, and then click Run.
  2. In the Open box, type regedit, and then click OK.
  3. Locate, and then click the following registry subkey:
    HKEY_CLASSES_ROOT \.html
  4. Make sure that the value of the String (Default) is “htmlfile”. If it’s not “htmlfile”, right-click (Default), click Modify, input htmlfile in the Value data box, and then click OK. See image.
  5. Exit Registry Editor.