getting back my SmartFTP Client

I bought SmartFTP Client a year ago and I lost my cd-key and I downloaded on your web site. I remember what e-mail I used. Its just that I just reformatted my pc, because my friend went to a site that downloaded viruses and spy ware and other stuff. It got to the point that nothing was safe to keep, not even my note pad that had my cd-key for SmartFTP Client. I scanned that note pad and found 15 viruses on it. I was like wow my whole computer is mess up. So I really need some help to get SmartFTP Client back.

Thank you