This is very easy to do for me so hopefuly it is for you to.
Step 1: Geting to Control Panel
First go to start and then click control panel.
Step 2: Geting to Display Settings
Next go to dispay and click display settings.
Step 3: Changing Display Setting
Next go to orientation and click landscape (flpped), click ok, and finaly click keep changes.
Step 4: Done
Now your screen should be flipped. To reverse do the same thing but click landscape not landscape (flipped).