Sorry to hear about that..
You can try to Contact Corel
, to see if they will provide a new download link. I would not hold my breath though. One service provided by Element 5 and now Corel is a 2 year download insurance. This is specifically for catastrophes such as yours.
It's always a good practice to burn your purchased download files to a CD or DVD immediately after you have them downloaded.
One thing to note you can still purchase this through Ulead's Website, however I could not find any mention of it on Corel's. That generally means that Corel has stopped support for it.