Having Startup Repair problem while trying to install SP1

[Sandy_Johnson]

I'm having Startup Repair problem from today in my Dell Vostro 1550 Laptop Windows 7 Ultimate, yesterday I tried to install Service Pack 1 but it didn't finished, it was getting stuck on 50%so I cancelled it then Restarted my Laptop.When I turned on my laptop it was showing me Peparing Pc or Configuring Service Pack.But they always got stuck on 10%, When I turned on my laptop after one day.It showed me an Startup Repair, and it couldn't Repair the Laptop by itself.And, I don't see any other option except Startup Repair and Cmd Prompt but it disappears after 1-2 seconds.Do I have to reinstall m

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