try 'Folder lock'
u can download it from here
http://www.newsoftwares.net/folderlock/
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If u want FREEWARE programmes, try these.
TrueCrypt :
TrueCrypt is an open-source encryption software that enables you to create a virtual encrypted disk within a file and mount it as a virtual disk, that can be accessed via a drive letter. Any file that is stored on this virtual drive is automatically encrypted on-the-fly, and can only be accessed while the drive is mounted with the correct password or key. TrueCrypt supports a variety of encryption algorithms, including AES-256, Blowfish (448-bit key), CAST5, Serpent, Triple DES, and Twofish. Other features include support for FAT32 or NTFS formatting, hidden volumes, hotkeys for mounting/dismounting and more.
http://www.snapfiles.com/Freeware/security/fwencrypt.html
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Encrypt Files :
Encrypt Files is a file encryption utility that enables you to encrypt the content of file, using a variety of secure algorithms including Blowfish, AES, Twofish, RC6 and others. Simply select the files from the integrated file browser and encrypt them, with the algorithm of your choice. The program does not change the extension or name of the file but highlights encrypted files in the file browser, so they can be identified later. Encrypt Files also includes a file shredder to permanently delete sensitive files.
http://www.snapfiles.com/Freeware/security/fwencrypt.html
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Androsa FileProtector :
Androsa FileProtector enables you to encrypt and password protect any type of file, including documents, images, videos etc. The program offers a choice of 3 encryption algorithms, AES 256/192/128 bit, TripleDES 192 bit and DES 64 bit and converts the protected file into a .AFP file. Once protected, the file can only be opened with the proper password. Androsa FileProtector integrates with Windows Explorer for convenient access from the right-click menu, and also provides a drag and drop interface to batch encrypt/decrypt multiple files. Other features include password strength indicator, file compression and more.
http://www.snapfiles.com/Freeware/security/fwencrypt.html
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EncryptOnClick :
EncryptOnClick is a simple encryption/decryption tool, that uses military grade 256-bit AES encryption which is fully compatible with WinZip 9. It encrypts selected files or folders and compresses them at the same time. The encrypted file can be decrypted by EncryptOnClick, as well as anyone that uses WinZip 9 and has the proper password.
http://www.snapfiles.com/Freeware/security/fwencrypt.html
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and many more.................
Hope this helps u.
Gud Luk.