You have probably installed all the necessary drivers for your Acer Aspire S7 Touchscreen Ultrabook after doing a clean installation of Windows 8.1. All the different hardware functions properly without reporting any missing driver or malfunction.
Image of Acer Aspire S7
What you have read about your Ultrabook is the screen can be rotated with the use of Fn + O keys. Only to your surprise the combination of the two keys don't work. This makes you to ponder where the problem is coming from.
System Requirements:
1) Windows 8.1 (64 bit architecture).
2) Acer Aspire S7 (all models).
3) Touchscreen Ultrabook
If you are having problem with rotating your Acer Apsire S7 Ultrabook Touchscreen with Fn + O keys this step-by-step information is meant for you to forestall the problem on time.
Image showing red arrow pointing to download at the trusted site
STEP 1: Go to Windows Compatibility Center and download Launch Manager for Acer Aspire version 4. It is a trusted site.
Image showing red arrow pointing to Extract All...
STEP 2: Right-click on the downloaded file and select 'Extract All..' . To extract the zip file click 'Extract' and follow onscreen instruction till complete.
Image showing red arrow pointing to Setup file
STEP 3: Scroll down a bit. Click on 'Setup' file and follow on-screen instruction till the installation is complete.
Image showing system restarting
STEP 4: Restart your system for changes to take effect.
Image showing a rotated screen
STEP 5: Hold down Fn key and repeatedly press O key to rotate the screen of your Ultrabook.