It is possible to fix it, but the way is too difficult IMO ! It is Office Icons – Change or Repair
. You can try need4steer
's post in the second page of that tutorial, but as I haven't tried it, not sure about how that trick works.
And, The easiest way to restore things is just to reinstall Office 2010 over the existing installation
. It will bring all those deleted icons back.
At the same time, if you have a junk/registry cleaner other than Ccleaner, this problem may occur once again.