What is the function of the zz at the upper part of the keyboard?

sounds like you have a button stuck..

The upper symbols on the keyboard are called function keys usually not expected to respond when pressed. functions keysy are ysed to control the computers settings either when malfcuntions occur or computer requires alternations to another feature possibility. Every available keys are displayeable besides fucntions keys on user productivity programs.

My version of this keyboard has a button in the upper left that toggles the function keys between their normal use and the MS Office specific use.

I found an answer which made it clear that the icons stood for short cuts to Internet, Email, Search; plus remote controls of video playbacks, volume controls and mute. The Internet one is the most useful.

To disable the sleep button on the acer keyboard Do the following (Vista home)
Go to control panel (classic view) double click Power options.
left hand margin select Choose what the power buttons do.
This opens a systems settings page
You will see an option :
When I press the sleep button: (Don't worry that the picture of the button is different than the keyboard's Zz)
Select Do Nothing from the dropdown box.
Click the Save changes button at the bottom of the screen.

This will disable the button on the keyboard...

press caps lock and F9 together see if that fixes it

Hi,

Try reseating the key board.

Check whether the keys are stuck especially the shift,alt,caps lock. 

Hav you spilled any liquid on the keyboad.

Try uninstalling any software you installed for the keyboard and remove it from Device Manager (Click Start-Run-Type devmgmt.msc and click OK).

Reboot and see if that helps anything. Also, check the right shift and make sure it isn't stuck and check the keyboard settings in the Control Panel

Update the keyboad software from the microsoft website.

Pleae mntion the model  number of the keyboard to help us know more about the keyboard.

You can try holding down function key and press f11.

Control Panel -> Regional and language settings -> Tab: Languages,
Button: Details, and add a US Keyboard.

Check this to know the functions

http://support.microsoft.com/default.aspx?scid=kb%3ben-us%3b894513

Check the keyboard settings.

Try using other keyboard to know the keyboard is fine or not.

This will help you i hope.

Good Luck.

Live, Love, Laugh.

Is the caps lock light illuminated? If so, you might have to hold shift and hit caps lock to turn off the caps lock. This is an option for old typists who came from manual typewriters that you might have turned on by mistake.