Password protecting files in XP and Windows Vista

XP

1. Select the folder you want to Encrypt and right click and Send To –---> Compressed Zipped folder.

2. This would create a Compressed folder with the same name, now open the folder by Right clicking on the folder and selecting Explore.

3. Go to the File menu and choose Add a password.

To remove the password in Step 3, go to the File menu and select Remove the password.

Vista

In Vista Ultimate version:

Right click any folder and go to the General tab and select the Advanced button.

Check the box next to Encrypt contents to secure data.

Un-checking would remove the encryption as well

Other versions of Vista:

Encrypt files utility is a free ware that allows you to encrypt and password protect your files

If you just want to password protect your files, Password protect software is free for 30 days.