Open the page you want to go to on start up then go to tools>options then in the 'general tab' you'll see the option for setting the home page click on 'use current' then click ok and the next time you go on line it should be the right page. It may not be a virus it may be that you opened a page with some options you wanted and one of the pre-ticked boxes said @make this my home page' it catches all of us out at times.