Please go to start, then control panel. Select the ease of access option. Then select, optomize visual display. Now scroll down to "make the things on the screen larger" If Magnifyer is turned on, uncheck the box. You can also click on Change the size of text and icons and make sure it is set on the defualt size. If it is on Larger scale, this could be your problem.
You can also check your desktop icons by right clicking on your desktop and selecting "view." You can then choose between small med and large icons.
I hope this has solved your problem and would appreciate an accept and feedback! Anymore questions please do not hesistate to ask!
All the best,
I am so glad that worked! If you have any more questions or problems please feel free to ask me! Thanks again!