cant get more that one web page to show at a time like before

Since I Remeoved A Lot Of Virsus's I Have Lost The Ability To Open Several Pages At One Time, Each Time I Want To Go To A Different Page,it Replaces The Current Page Which I Would Like To Be Able To Refer Back Too With Out The Hassel Of Looking Up History Etc. Any Help Will Be Appreciated, Is This A Soft Ware Problem?,i Went Into The Inter Net Tools And Unchecked Reuse Windows For Launching, I Was Advised To Do That, But Either Way It Didnt Help.