White Page At Startup Unable To Get Rid Of It?

Last week I was on the internet on my Dell Studio laptop. I opened a new tab and all of a sudden the entire screen was filled with a 'internet cannot display the page' page. I know this page appears when you are browsing the net and loose connectivity, however, after restarting my laptop, the home screen appears and a couple of seconds later disappears and the white page comes up. I canot access the menu bar or anything else when the page appears. I have pressed nearly every combination i can think of to get rid of it and it stays there. there is no 'x' box at the top to close it. The only thing that worked was when i pressed ctrl+alt+delete and this brought up the task manager option, however when i cliscked on start task manager it appeared for a second and then disappeared, like its going behind the white page.