Thanks so much! You have made one 10-year old very happy (and saved my ass). I did have quicktime and I had tried everything from the link in your first suggestion already (amongst other links I found) but to no avail.
What did it was your second link that brought me to InstallShield where I was instructed to download the correct version of ISScript. Oddly enough I had been to this site already and had entered my problem in their search but was not offered this option.
Am not sure where you're from but if you're ever in Ireland then drinks are on me (you may have to drink alone though as I come from a rare breed of Irishmen that doesn't drink).
I've received and given help on this forum before but this is the most rewarding yet. Thanks!