windows7 boot problem

hi i am using an acer aspire4736 model laptop.unknowingly i have cleared registryfiles with tuneup software.From then my system is not loading o.s.just it is showing boot options then a blank screen is appearing and again boot options like that.and i tried to boot it from pendrive but it is showing the option to boot from pendrive but i was unable to boot.then i tried with a DVD then it is not showing any option to boot from a DVD.please help me.
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More about windows7 boot problem
  1. you need to set the boot order in the bios (F2 at bootup for Acer laptops)

    Could be a coincidence that something has failed at the same time - test all your hardware

    Might have to do a fresh install of Windows here...

    Tip: all the "registry" cleaner tools are all BS, this is a great example.
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