System Restore or how to re-load Windows 7 from scratch

  fotocall 18:40 07 Sep 2013

I have a friend's Samsung Model NP-N150-JA01UK that starts very slowly and reaches the Desktop but does not let me open the Control panel or anything else to do a System Restore. After is few minutes it invariably shows a blue screen for a few seconds saying it has failed and reboots offering to start in'Safe Mode' etc. One of the choices is to start with the C- prompt that does seem to work. Can I use this way in to effect a System Restore perhaps? All ideas very welcome.

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