Hello Linda,
I would suggest you to adjust the display settings as suggested in this article https://support.microsoft.com/en-us/help/14217/windows-8-get-best-display-on-your-monitor and if the issue persist, please contact your PC manufacturer support or Microsoft for help.
My settings seem to be linked to my old smaller screen and everything is stretched since it seems to be set for the old screen. It happened when I went from Windows 8 to 8.1
Hello Linda,
I would suggest you to adjust the display settings as suggested in this article https://support.microsoft.com/en-us/help/14217/windows-8-get-best-display-on-your-monitor and if the issue persist, please contact your PC manufacturer support or Microsoft for help.