Links Bar drop down tab not readable

Hi!

Have a weird problem with my links bar in IE. Have a great number of urls saved for handy reference and when I click on the drop down tab & scroll everything turns dark blue with black lettering which is impossible to read. When I get halfway down the urls show normal (black lettering on beige background and turn dark blue with white lettering as you scroll over them.

Can anyone tell me what would cause this & how I can correct it?

My OS is Windows ME - Dimension 4100 - Internet Explorer 6.

Thanks.