Pixelated images and text.

This is an issure ive only have for the last couple days but when i drag a cut out image over to another document it is appearing pixelated. i havent messsed around with any settings to cause this to happen its just random started happening.

Also even when i type on a different document its coming out as very pixelated and blurry. I am not zoomed in or anything cause even when i do zoom in i can see how pixelated it really is. 

The one witht he text i saved as a JPEG and the quality was fine. What have i done wrong on photoshop for it to appear the way it does because then when i added it to the main thing im working on and save that as a JPEG it is then pixelated?!