When I open mozilla Firefox the computer screen freezes. This is not happening all the time but very frequently to my annoyance. When it happens, the bar at the bottom of the screen which carries, inter alia, the word START does not show up as the screen shows only a huge white blank page that occupies the whole width of the screen.

My only option left is to click on Ctrl and Alt and Delete on keyboard to switch off the computer completely.

Can anyone help plse?

I use Windows XP.

My usual thanks from a retired civil servant pensioner.

Joe