Since auto update on 25/4/2013 my laptop will not start unless I run startup recovery

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Windows 7 home premium 64 bitI had an auto update on 25th April now my computer onmly starts if I run startup reovery, and then it reverts to a pre up date configuration, and when I boot again it reloads the update , and the cycle starts againHow do I repair the update?Is the update essential?Is the update good?thanks

 

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