Problem with classic and keyboard


I am having a HUGE problem with classic. The 'a' button randomly pushes itself and holds itself down all the time. It makes it impossible for me to use Adobe software!!! I high light something in GoLive and my magic 'a' button deletes it!!! I try to draw in photoshop and my magic 'a' button turns my brush tool into an arrow tool!!! It ONLY happens in classic, and I know it happens in these two apps... but I really don't use too many other apps too much, but I have never noticed it in any other apps. And it either is happening constantly, or not at all. Its the most annoying thing and it is absoulely driving me fucking crazy!!!!!! If you know whats up, please help!!!