To Lock a folder in windows XP without any software. Follow the steps Below. Make a Folder in C drive rename it as " abc " without quotes. Now open Command Prompt from Start Menu. Type " attrib +s +h C:\abc " without quotes and press enter. This command will Make your folder invisble and it can not be seen even in hidden files and folders 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.