My Iphones Home on Isnt Responding Please Help Me Fix It!Thanks

Ive Been Having Trouble For The Last 2 Days With My Iphone!....I Updated The Software On It 2 Days Ago While I Was Putting Songs On It!...I Had No Trouble With The Home on Before Until I Updated The Other Day When I Plugged It Out Every Else Was Fine Until I Pressed The Home on!...I Think Its The Software Update That Stopped It Working Is There Any Way Of Puting The Software Back The Way It Was Before I Updated it?...Please People I Really Need My Iphone To Work!...:(....Im Lost Without It!..Thanks!=D