What happens when you try " ... clicking on a link in order to load or to jump to other pages or windows"?
Have you tried to duplicate the problem with another browser, such as Firefox? If so, what happens?
What is your Win2k installation's Service Pack and update status?
What is your IE6 installation's update status?
What version of Javascript Runtime do you have installed?
Have you uninstalled the Microsoft Virtual Runtime Engine?
If you are using a firewall (and you should be), have you checked its log and its application permissions to see if the problem might be there?
You may find
This Fix to be of help - but first be certain all of your updates, including Windows Service Packs, Windows Security Updates, IE Browser Updates, and Java are current, and that there is no firewall issue.