To Lock a folder in windows XP without any software. Follow the steps Below :

Step 1 : Make a Folder in C drive rename it as "abc" without quotes.

Step 2 : Now open Command Prompt from Start Menu.

Step 3 : Type "attrib +s +h C:\abc" without quotes and press enter.

        This command will Make your folder invisible and it can not be seen even  in hidden files and              folders

Step 4 : To make it visible again type "attrib -s -h C:\abc"



*/*/ You can lock any other folder also by changing the location C:\abc to address of your folder. */*/