Need help with size of letters on screen?

For the past few days I've had a problem with the size of the letters on my desktop. In order for me to see anything I had to increase the magnification to 150%. That works ok for the main screen itself, but icons and words at top and bottom of screen are so small I can't read them. I'm really self... show more For the past few days I've had a problem with the size of the letters on my desktop. In order for me to see anything I had to increase the magnification to 150%. That works ok for the main screen itself, but icons and words at top and bottom of screen are so small I can't read them.
I'm really self taught in using computers..so please try not to be to technical in your answers..BUT HELP!!
Update: Barbara..what is the dpi? where would I find it..control panel?
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