Keyboard not working, various symptoms

My Inspiron 8600 Laptop has begun to malfunction on me.  After the laptop has been on for awhile when I press any key on the keyboard they do not function.  A pop up box for a function I didn't request will come up.  Like a "insert hyperlink" box when in a word document instead of typing the letter 'f' when I press the 'f' key (or any key for that matter the same thing occurs).  When I am in a web browser connected to the internet a 'search for text" box comes up when pressing a keyboard key instead of typing the letter or number or the key pressed.  Also, if I try to open a new word document the message comes up that 'word has detected that you are holding down the control key. Do you want to start Word in safe mode?' and I am not holding down that key.  Some keys when I press them make a beeping noise although they do not type and other keys don't make that beeping noise when I press them (though they also do not type).  Any ideas what could be the problem? Or any steps I could take the remedy the situation.  This problem came out of nowhere without anything particular I can think might have caused the malfunction. 

 

Also, when I restart the computer it sometimes works for a bit before going into this problem, but other times I can't even log in to my account.  I haven't downloaded any new software recently that would have caused this new problem either.

 

Thanks so much.