I'm sorry about the issue. What happens when you go to the gmail.com website?
Can you click on Start (which is the windows logo icon located at the bottom left of the computer's screen), then click on option All apps, then scroll down as needed, then do you see your programs there?
Can we do a remote support session, so I can troubleshoot the issue directly on your computer together with you?
Please reply at the box below. Thank you,