KingXtreme

When i try to start up Intertnet explorer i get i security warning prompt that says SECURITY WARNING Dear Internet Bank User, it goes on to tell me about my account verification and they need the number to access my account to prove that i'm the owner of the account. then theres a box to type the account number and a check button when i type something in the box and press check the computer crashes don know what to do? need help fast! thanks windows 98 cable modem IE 6sp1