Why am i able not able use windows+d to minimize

nisha krishnnan ( ) (27 Points)

28 December 2012  

Friends 

 

Usually I use to WINDOWS + D to minimize all programs and applications and to move to desk top, but I dont know the reason know am not minimize when i use that shortcut in WINDOWS 7 

 

And I am not able use the short cut CTRL+ALT+DEL to open task manager