At Os Windows Xp on network, we can protect the data folder for files and folders cannot access other people, so here we go :- Open Control Panel (click Start Menu - Control Panel - click User Accounts, click Guest account- So click tombol Turn on the Guest Account- After click turn on and then go to start menu and then click Run- Then Type CMD- And Command prompt window is opened- Then type Net user guest password and then press enter- If successful then Open back Control Panel, – User Accounts - click Guest Account - click Change Password- Type the contents of the password in the New Password field and repeat again on the field Type New Password...