Can you use Encarta 2003 with Opera or Mozilla? If you can then you should get these browsers. If not then I really have no clue what's happening with your IE6. Maybe if you install Service Pack 4 which is out for Windows 2K you can install IE6 without any errors. Have you already tried to format your computer, install Windows 2K and try to install it again? For me the format tool is my friend

Always helps me in urgent situations. Hope this helps! Good Luck
dan