Mozillia

Why is it I sometimes get info back from some sites that say my browser is Mozillia 4.0 when I have MSIE 6.0 installed? How do I fix this? I do not have Mozillia, I do a find files and always dlete anything that says mozillia and it keeps coming back. I have no idea where it came from or how it got on my PC. IE6 looks and acts normally but apparently it’s telling everyone I have mozillia 4.0 as my browser!