Hello

Whenever i type a letter some window appears or the volume turns up or appears a lot of symbols and letters, what can i do?

which model of lenovo you are using?

Lenovo Y560d

Had a similar issue. Not sure if it exactly fit yours but refer here

http://forum.lenovo.com/t5/IdeaPad-Y-U-B-V-and-Z-series/Random-Unwanted-Keyboard-Shortcuts/td-p/238763/page/2

un-install guarded id application.

http://forum.lenovo.com/t5/Lenovo-3000-and-Value-line/Typed-letters-appearing-as-increasing-numbers-0-1-2-3-4-5/ta-p/306606

On the startup doesn't appear the GID application

restarted your computer after un-installing guid?

also, try this :

right click my computer > manage > device management > keyboards > select keyboards then right click un-install > restart your computer and check if it works.

Hi, my name is Matt and I have a problem with my keyboard. The product that I have is the Ideapad Y560, and in games, my keyboard doesn't function properly. The games are relatively new (Starcraft 2 and various flash games on game websites), so I do not think that it is a problem with the games. If you are a Starcraft player, you know that you have to use hotkeys and press certain buttons such as "A" for attack, and "S" for stop.  But in game when I press a key, the number keys respond instead.  For example, when I want to press "A", the "1" key would respond.  If I press another key immeadiately after, the "2" key responds. And the pattern repeats in numerical order until I exit the game.  The keyboard works fine out of game, as you can see, but as the 13 year old I am,  this is quite frustrating.  I have searched online for similar problems, and I have found a few, but none have been resolved.  Can anyone please help? Thanks.  If you need more information, just respond to this and I will answer gladly.  

@ gamerkroux

as i suggested before, removing guarded id application will fix your issue.

please, take a look at the message i posted above.