How to use simple passwords to protect Directories, same as Files

[carsoneb]

I can protect Word and Excel 'files' minimally by using a simple password.
I would like to do the same for a complete 'directory'.
I.e., most of my directories and files do not need protecting other than in
turning on the computer. But I want to protect a couple of directories that
have so many files in them that it is a nuisance to have to password each
individual file. I am using XP Office.
Thank you
carsoneb