Seems corrupt. Have you still got the original install files? I'd try uninstalling and reinstalling.
I'd imagine Microsoft still have files available for download try https://www.microsoft.com/en-gb/download/office.aspx
I'm pretty impressed with the Pixel my friend has. It's not the new one, but the screen and pictures on it are a lot better than my iPhone 6. It's also fairly cheap! Can get it on around £20/month contract.