Thanks for your response. I can see that, at first glance, my query appears very simple and it is difficult to resist sounding patronising in those circumstances.
The irony is that none of those links you kindly posted has what I'm looking for. Microsoft no longer offers the original option pack for download and there was no option pack available on the other site you mentioned. Nor could I find it anywhere else on the web after searching on google, download.com and others for over an hour.
I would be happy to concede how easy it is find what you want on the web once someone posts a link to the aforementioned file.