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Changing your screen's resolution can make a big difference in how things are displayed.  The screen's resolution is measured in Dots Per Inch or DPI.  A display is made up of thousands of tiny dots, also known as pixels.  In the old days of picture tubes if you got close to your television you could see all the tiny dots which made up the picture.  Each one of those was a pixel.

It may seem counterintuitive at first, but the higher you set your computer's DPI, the smaller everything will get on the screen.  This is because the DPI measurement is the number of those dots or pixels which are squeezed into a single inch of screen.  To sqeeze more dots into an inch of screen each dot must be made smaller.  Since the icons on your Desktop and the text under them are a certain size measured in dots, if you fit more dots into a single inch then those icons and that text get smaller.  They are the same size in dots, but those dots have become smaller.  The end result is the higher the DPI, the smaller everything looks.

You may wish to change your screen's resolution for a number of reasons.  You may want things to look better (higher DPI) or you may want things on the screen to be bigger and more readable (lower DPI).  To change the resolution of your screen simply right click on a blank space on the Desktop and a menu will come up, as always.  In Windows 7 left click on "Screen Resolution".  In Windows 10 left click on "Display settings".  In either one the resolution is right there to change.

One important thing to note is that your computer may allow you to choose a resolution which doesn't work with your screen.  The screen may go completely black and show nothing when you change the resolution.  Don't panic!  When you change the screen's resolution a countdown of 15 seconds is started.  If you do not click the "Accept" button before that countdown reaches 0 the resolution will automatically revert to the previous setting.  Just don't do anything while you wait for it and it will come back.

Another important thing to note is that these days computers can detect the "optimal resolution" for modern monitors.  This setting will have the word "Recommended" behind in.  This is the setting which the screen manufacturer says will look best on that screen.  That does not mean that you have to keep that resolution, however.  You can change it to anything you like.

There is another, sometimes better option for making icons and text bigger without reducing your screen's resolution.  It's in the same settings on both Windows 7 and 10.  In Windows 10 it's under the header, "Change the size of text, apps and other items".  In Windows 7 you have to click on "Make text and other items larger or smaller".  This is normally set at 100%, but it can be set higher.  125% is pretty safe, but starting at 150% some poorly designed programs will not display properly.  For example, if you try to uninstall Avast antivirus with this set to 150% it is impossible to see or click on the "Uninstall" button.  You have to set this smaller to be able to click that button.