Nokia N95 Lcd Screws

Question

Hey , I've Got A Nokia N95 And Last Week I Broke The Screen So Need To Replace , When I Slide Up The Phone To Take The Front Cover Off , The T5 ScrewDriver Won't Undo The Screws , I Think The Screws Have Been Rounded , Or I'm Using The Wrong ScrewDriver , If It's The ScrewDriver Please Tell Me What One I Should Be Using OR If Its The Screws And There Rounded , How Else Could I Get Them Off ? Thanks