is it only on graphic intensive sites? have you tried after disabling images?
tools > internet options > advanced > multimedia > show pictures
you might try XP Service Pack 1 and there is also a service pack available for IE6
all these will be offered to you at windowsupdate.microsoft.com if you dont have them, or failing that you can get them at ;
http://www.microsoft.com/windows/ie/...p1/default.asp
http://www.microsoft.com/WindowsXP/p...p1/default.asp
You'll probably need broadband to download these, you'll find XP SP1 on cover disks for good PC magazines
Try these and let me know if no joy