WinFileCrypt is a simple windows application that is used to encrypt files. It uses 3DES cipher-block-chained encryption, with a 128 bit key which makes it simple to protect your files. 
Just specify the path of the file and write the encrypt key and click Go. It will encrypt the file. When you want to decrypt the file, you need to specify the key provided while decrypting. And the best thing about this software is that you dont have to install it.
Download : WinFileCrypt
