Well, you may be able to recover these files from your hard drive with an "Undelete" program...
Webattack search on "Recover" and "Undelete"
Google search on "Recover" and "Undelete"
Try those. I guarantee you'll find
something that will recover lost files (I'm not guaranteeing that you'll get these files, but the sooner you try the better)
Again, store your frequently used FTP sites in your favorites. Export your favorites to a text file and put the file on a disk.