problem wit POP UP blocker

i am registered with an internet banking website which calls up a pop up for password login(its an onscreen keyboard where u input ur passwrd via mouse). now my problem is when ever i want to enter my password that essential pop up is being blocked. i have tried to unblock it via tools (oh im using internet explrer6) i have even added the site to a list of exceptions to be unblocked. inspite all of this, the pop up keeps being blocked hence i can't log in. but the thing is, on other machines the pop up is not being blocked as soon as i set it not to be blocked

my Specs: winXP SP