Free secure ftp client for Windows platf

Go to download.com and search for ftp. A list of ftp programs will appear, some free, some shareware, and of course some for sale. Take a look and see if any meet your needs.

I have not come across any ftp program that are completely secure. I use CuteFTP and a good virus program and I am covered. This program is compatible with all your needs and it is free.
WF_FTP pro is another good reliable ftp program and you candownload a demo version of this to test it. Remember to us a good virus software program with it.

Check here.

http://www.ssh.com/products/ssh/specifications.html

Good Luck!