To encrypt a file or folder
1. Click Start--> point to All Programs--> point to Accessories--> and then click Windows Explorer.
2. Right–click the file or folder that you want to encrypt--> and then click Properties.
3. On the General tab--> click Advanced.
4. Select the Encrypt contents to secure data check box.
If you have chosen to encrypt a single file, you can also choose to encrypt the folder that contains it. Select Encrypt the file and the parent folder in the Encryption Warning dialog window. All files created in the encrypted folder will now be automatically encrypted.
If you encrypt a folder instead of a single file, you can choose to encrypt all the contents of the folder as well.
Decrypt a file or folder:
1.Click Start, point to All Programs, point to Accessories, and then click Windows Explorer.
2.Right–click the file or folder that you want to encrypt, and then click Properties.
3.On the General tab, click Advanced.
4.Clear the Encrypt contents to secure data check box.
Whoever accesses your computer, will also be able to access a decrypted file or folder. Windows XP Professional gives you the power to help keep your files and folders safe from unauthorized access. Use Windows XP Professional to encrypt important information on your computer and help keep your data safe.