Hi Derek, If I were you I would first of all try to repair the existing IE5.
Not too sure about Win ME but in Win 98 you would
Go to Start/ Programs/ Accessories/ System tools/ System information/ Tools and select the IE repair tool.
If it will repair, then, and only then, try and install IE6 over the top. Don't try and remove IE5 or you will most likely lose your existing info.
If it will not repair, go into Control Panel/ Add, Remove Programs and see which version of IE is installed.
If it's not listed in Add/ Remove Programs it could be in the Windows Setup part.
See how you go and post back.