In short, installing IE 6.0 will be all that's needed. If you are a neatnik, then see if you can backup your favorites and OE data, then use IEradicator to wipe out IE from the machine, then install IE 6.0 then proceed directly to the service patches.
But why do this? Why not install Mozilla or such, get a more secure browser and more features. Leave IE as-is for when you feel Moz isn't working for you (Hint: Windows Update.)
I have a Microsoft CD of Internet Explorer 6 which I want to install on my PC.
Do I have to uninstall the 5.5 Version which I now have prior to that installation, or can I install the 6.0 Version first and then uninstall 5.5?