weird keyboard binds

i pressed or done something i shoulden and carnt remember what i did.
When i press a letter on desktop for instance g my gamespy icon lights up and if i press again google earth lights up and its the same for all letters and then f1 is help and suport f3 is search its really anoying when im playin a game and i press w to move it shuts down the game window and continuesly does so if any1 knows what i have done or pressed to get this really anoying thing on my pc then please help me!!!! and thanks to any1 who does

The F1 > F12 keys are standard hotkeys. They are supposed to open various things.

As to your regular keys did you set any hotkeys in a program or game?

If this is a new problem try a System Restore to a point prior to the problem:

start > All Programs > Accessories > System Tools > System Restore

Also verify that your Ctrl and Alt and Windows keys are not stuck or being unconsciously pressed.

Used in conjunction with standard keys these also trigger hotkey actions.