Assalamualequm

Me apna computer format Karna chahte hu USB pen drive se

Lekin Uske liye First boot pen drive karne ke liye F11 Ya delete daba ker boot menu me Jana hota he Vo computer restart Kar ke Nahi ho raha he. Lihaza Agar Koi dusra tarika ho to zarur bataye.. Me bahot peresha hu bahot try Kiya Lekin Nahi ho raha he. Window 7 install he me ab window 8.1install karna chahta hu. Please help me

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