For All Windows ----- Chat Download........YakChat4400.exe
1.. Go to START THEN CONTROL PANEL.
2.. Top right of control panel you see a search box.
3.. Type in UAC
4.. link on left should be SET UAC = User Account Control click it.
5.. Then drag BAR to the bottom and Reboot your pc thats it.
6.. In Vista it may say turn UAC on or off turn it off AND Reboot your pc.