That was only in WMP 10.
@randycmj98 I see you have posted this on another Windows support site. It seems, after some research, the feature to 'lock' the WMP screen in party mode has been removed from WMP 12. I have looked through all of the WMP options, cannot find anything to do with 'locking' the screen.
CPU - Corsair Hydro H80i, Case - 3x Aerocool Shark Edition
Keyboard
Xenta Backlit Keyboard (Not very good!)
Mouse
Logitech G400
Internet Speed
Download: 7 mb/s Upload: 0.76 mb/s
Antivirus
Microsoft Security Essentials
Browser
Google Chrome
Other Info
Overclockers UK Desk Pad 89 x 45 cm
1200x730x600mm Desk
Using Virtual Audio Cable to split stereo sound into Audio Technica ATH-M50 headphones and Logitech X-530 speakers.
Don't give up, you could find a different player that can do the job for you
Or find a program that can lock the screen as an application
Just let me do some hunting on the web
CPU - Corsair Hydro H80i, Case - 3x Aerocool Shark Edition
Keyboard
Xenta Backlit Keyboard (Not very good!)
Mouse
Logitech G400
Internet Speed
Download: 7 mb/s Upload: 0.76 mb/s
Antivirus
Microsoft Security Essentials
Browser
Google Chrome
Other Info
Overclockers UK Desk Pad 89 x 45 cm
1200x730x600mm Desk
Using Virtual Audio Cable to split stereo sound into Audio Technica ATH-M50 headphones and Logitech X-530 speakers.
When you click on its icon in the system tray, it locks the screen in a matrix style animation. You enter a password to unlock it.
Some examples can be found on Youtube.
CPU - Corsair Hydro H80i, Case - 3x Aerocool Shark Edition
Keyboard
Xenta Backlit Keyboard (Not very good!)
Mouse
Logitech G400
Internet Speed
Download: 7 mb/s Upload: 0.76 mb/s
Antivirus
Microsoft Security Essentials
Browser
Google Chrome
Other Info
Overclockers UK Desk Pad 89 x 45 cm
1200x730x600mm Desk
Using Virtual Audio Cable to split stereo sound into Audio Technica ATH-M50 headphones and Logitech X-530 speakers.