Diskfailure-need installation media

The hard disk that contained my C-drive failed. I have a new disk, and I'm re-installing WinXP 32-bit from scratch.  When I purchased Norton Basic System Works last year, I recall downloading the software from the internet. I no longer have the download file.  I do have the Product Key.  Is it possible to re-obtain the download?  If so, how?  I've tried reading the help information at http://www.mynortonaccount.com  But I can't seem to find any information there about how to recover the download media in a case like mine.  If I blew it, by not saving the download file, I take responsibility for my stupidity and will learn from the mistake. But if it is possible to re-obtain the download, without paying for a new subscription, can someone tell me where I can find the instructions for how to do that?   Thanks in advance for any/all help.