critical update wiped my PC

  cossied 19:51 15 Dec 13

I started my Sony laptop today and it came up with a different desktop ie only 3 panes, a MSN home page instead of my saved one, it then asked me to verify my Microsoft account, I then noticed that all my music and picture folders were empty ?. Most of my icons had also disappeared. Went to my restore options and saw a critical update at 14:00 15/12/2013 I restored it OK but I am worried the update will install again and wipe my documents out again .any ideas ?

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