"Clipboard" message can't be closed on web page; entire page locke

I have IE version 6. I am currently taking courses online. I can log on to

the test site successfully, but when I click on the link to begin the test,

the information box from Internet Explorer pops up asking me if I want to

"allow this page to paste information from my clipboard". I click both no,

yes, and exit buttons. I get a flash of the box, nothing else happens I

cannot remove this box from my screen. Subsequently, the page is locked. I

have to restart my pc to fix this. Can someone please help me, I need to be

able to take these tests from home. I don't know much about computers, but

any help would be greatly appreciated.