Hi Amazing Grace,
click on your desktop and choose properties. Having
opened Desktop Property control panel go to the tab at the end "Settings".
On the "Settings" tab click on Advanced. In the page that appears will be
one that reflects your monitor, it being different for different installed
display adaptors but, around there there will be a tab will the capabilities
of your particular display adapter. On mine its under "Intel Extreme
Graphics" and then press on the "Graphics Properties" button. Then it's
under "Rotation" (set it to Normal) but yours could well be something
slightly different. But it's sure to somewhere around there. Hope this is
of some use to you.