Danger Keep track of your password, there is no way to undo this.
If you want to enhance the security and do not want others to view the contents of your compressed folder, you can assign password to the compressed folder orzip file. Locate your compressed folder or zip file in Windows Explorer or My Computer, then open the folder by double clicking on it. From the File menu, choose “Add a password…” (Encrypt in Windows Me), and key in your password twice then click on OK.
Note that all of the files in compressed folder are password-protected at the time of encryption or password adding. Any subsequent files will not be password-protected, to password protect subsequent files, the password needs to be removed and added again.
Note: Add a password to compressed folder (ZIP) is only available in Windows XP. Windows Vista and Windows 7 have removed such option, and user has to use third-party tool such as SecureZIP to password-protect compressed folders.
Password Protect Compressed (zipped) Folders and Hence Your Files and Folders » My Digital Life