File encryption help..

I had a nifty encryption program a little while back that attached itself to the right-click menu of windows explorer, you selected your files, hit encrypt and put in either a password or you'd draw your signiture onto the screen... it would then encrypt the files and rename them so a "SD_" would appear out front of whatever they were called.. their original file extention intact.

Problem arrises when I forgot about this and recently formated my Windows partition, now I don't have the program AND can't remember what it was in order to decrypt my encrypted files.. would anyone have an idea what it could be?

Assistance would be apreciated!